wget命令

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命令用途

wget 是一个用于非交互式网络文件下载的 Linux 命令行工具，支持 HTTP、HTTPS 和 FTP 协议，能够递归下载文件或镜像整个网站。

常用用法示例

1. 下载单个文件

   wget https://example.com/file.zip
   --2024-01-01 12:00:00-- https://example.com/file.zip
   正在解析主机 example.com... 1.2.3.4
   正在连接 example.com|1.2.3.4|:443... 已连接。
   HTTP 请求已发送，正在等待响应... 200 OK
   长度：1024 (1.0K) [application/zip]
   正在保存至: "file.zip"
   100%[================>] 1,024 --.-K/s 用时 0.01s
   2024-01-01 12:00:01 (1.00 MB/s) - 已保存 "file.zip" [1024/1024])

   从指定 URL 下载文件到当前目录。

2. 指定输出文件名

   wget -O backup.zip https://example.com/file.zip
   --2024-01-01 12:00:02-- https://example.com/file.zip
   ...（输出与示例1类似）
   已保存至 "backup.zip"

   通过 -O 参数将下载文件重命名为 backup.zip。

3. 后台下载

   wget -b https://example.com/large-file.iso
   继续在后台执行，PID 为 12345。
   输出将写入 "wget-log"。

   使用 -b 参数让下载任务在后台运行。

4. 断点续传

   wget -c https://example.com/interrupted-file.iso
   --2024-01-01 12:00:03-- https://example.com/interrupted-file.iso
   正在尝试续传...
   已恢复 "interrupted-file.iso" 的下载
   [======> ] 50% 512K/s 剩余 10s

   通过 -c 参数恢复中断的下载任务。

5. 递归下载整个网站

   wget -r -l 2 https://example.com
   --2024-01-01 12:00:04-- https://example.com
   ...（递归下载日志，包含子页面和资源）

   -r 启用递归下载，-l 2 限制递归深度为 2 层。

6. 限制下载速度

   wget --limit-rate=100k https://example.com/big-file.iso
   --2024-01-01 12:00:05-- https://example.com/big-file.iso
   ...（下载日志，速度限制在 100KB/s）

   通过 –limit-rate 将下载速度限制为 100KB/s。

7. 批量下载多个文件

   wget -i url-list.txt
   --2024-01-01 12:00:06-- https://example.com/file1
   ...
   --2024-01-01 12:00:07-- https://example.com/file2
   ...

   通过 -i 参数从 url-list.txt 文件中读取多个 URL 进行批量下载。

8. 下载需要认证的文件

   wget --user=admin --password=secret https://example.com/protected-file
   --2024-01-01 12:00:08-- https://example.com/protected-file
   正在验证用户名 "admin"... 已认证
   开始下载...

   使用 –user 和 –password 参数提供 HTTP 认证凭据。

常用参数选项

• -O <文件>
  指定输出文件名，避免使用 URL 中的默认文件名。
• -b, –background
  后台模式运行，适合大文件下载。
• -c, –continue
  断点续传，恢复未完成的下载。
• -r, –recursive
  递归下载，用于抓取整个目录或网站。
• –limit-rate=<速度>
  限制下载速度（如 100k 或 1m）。
• -i <文件>
  从文本文件中读取多个 URL 进行批量下载。
• –user=<用户名>, –password=<密码>
  提供 HTTP/FTP 认证的用户名和密码。
• -q, –quiet
  静默模式，不输出下载过程信息。

原厂文档

NAME

       Wget - The non-interactive network downloader.

SYNOPSIS

       wget [option]... [URL]...

DESCRIPTION

       GNU Wget is a free utility for non-interactive download of files
       from the Web.  It supports HTTP, HTTPS, and FTP protocols, as well
       as retrieval through HTTP proxies.

       Wget is non-interactive, meaning that it can work in the
       background, while the user is not logged on.  This allows you to
       start a retrieval and disconnect from the system, letting Wget
       finish the work.  By contrast, most of the Web browsers require
       constant user's presence, which can be a great hindrance when
       transferring a lot of data.

       Wget can follow links in HTML, XHTML, and CSS pages, to create
       local versions of remote web sites, fully recreating the directory
       structure of the original site.  This is sometimes referred to as
       "recursive downloading."  While doing that, Wget respects the
       Robot Exclusion Standard (/robots.txt).  Wget can be instructed to
       convert the links in downloaded files to point at the local files,
       for offline viewing.

       Wget has been designed for robustness over slow or unstable
       network connections; if a download fails due to a network problem,
       it will keep retrying until the whole file has been retrieved.  If
       the server supports regetting, it will instruct the server to
       continue the download from where it left off.

OPTIONS

   Option Syntax
       Since Wget uses GNU getopt to process command-line arguments,
       every option has a long form along with the short one.  Long
       options are more convenient to remember, but take time to type.
       You may freely mix different option styles, or specify options
       after the command-line arguments.  Thus you may write:

               wget -r --tries=10 http://fly.srk.fer.hr/ -o log

       The space between the option accepting an argument and the
       argument may be omitted.  Instead of -o log you can write -olog.

       You may put several options that do not require arguments
       together, like:

               wget -drc <URL>

       This is completely equivalent to:

               wget -d -r -c <URL>

       Since the options can be specified after the arguments, you may
       terminate them with --.  So the following will try to download URL
       -x, reporting failure to log:

               wget -o log -- -x

       The options that accept comma-separated lists all respect the
       convention that specifying an empty list clears its value.  This
       can be useful to clear the .wgetrc settings.  For instance, if
       your .wgetrc sets "exclude_directories" to /cgi-bin, the following
       example will first reset it, and then set it to exclude /~nobody
       and /~somebody.  You can also clear the lists in .wgetrc.

               wget -X "" -X /~nobody,/~somebody

       Most options that do not accept arguments are boolean options, so
       named because their state can be captured with a yes-or-no
       ("boolean") variable.  For example, --follow-ftp tells Wget to
       follow FTP links from HTML files and, on the other hand, --no-glob
       tells it not to perform file globbing on FTP URLs.  A boolean
       option is either affirmative or negative (beginning with --no).
       All such options share several properties.

       Unless stated otherwise, it is assumed that the default behavior
       is the opposite of what the option accomplishes.  For example, the
       documented existence of --follow-ftp assumes that the default is
       to not follow FTP links from HTML pages.

       Affirmative options can be negated by prepending the --no- to the
       option name; negative options can be negated by omitting the --no-
       prefix.  This might seem superfluous---if the default for an
       affirmative option is to not do something, then why provide a way
       to explicitly turn it off?  But the startup file may in fact
       change the default.  For instance, using "follow_ftp = on" in
       .wgetrc makes Wget follow FTP links by default, and using
       --no-follow-ftp is the only way to restore the factory default
       from the command line.

   Basic Startup Options
       -V
       --version
           Display the version of Wget.

       -h
       --help
           Print a help message describing all of Wget's command-line
           options.

       -b
       --background
           Go to background immediately after startup.  If no output file
           is specified via the -o, output is redirected to wget-log.

       -e command
       --execute command
           Execute command as if it were a part of .wgetrc.  A command
           thus invoked will be executed after the commands in .wgetrc,
           thus taking precedence over them.  If you need to specify more
           than one wgetrc command, use multiple instances of -e.

   Logging and Input File Options
       -o logfile
       --output-file=logfile
           Log all messages to logfile.  The messages are normally
           reported to standard error.

       -a logfile
       --append-output=logfile
           Append to logfile.  This is the same as -o, only it appends to
           logfile instead of overwriting the old log file.  If logfile
           does not exist, a new file is created.

       -d
       --debug
           Turn on debug output, meaning various information important to
           the developers of Wget if it does not work properly.  Your
           system administrator may have chosen to compile Wget without
           debug support, in which case -d will not work.  Please note
           that compiling with debug support is always safe---Wget
           compiled with the debug support will not print any debug info
           unless requested with -d.

       -q
       --quiet
           Turn off Wget's output.

       -v
       --verbose
           Turn on verbose output, with all the available data.  The
           default output is verbose.

       -nv
       --no-verbose
           Turn off verbose without being completely quiet (use -q for
           that), which means that error messages and basic information
           still get printed.

       --report-speed=type
           Output bandwidth as type.  The only accepted value is bits.

       -i file
       --input-file=file
           Read URLs from a local or external file.  If - is specified as
           file, URLs are read from the standard input.  (Use ./- to read
           from a file literally named -.)

           If this function is used, no URLs need be present on the
           command line.  If there are URLs both on the command line and
           in an input file, those on the command lines will be the first
           ones to be retrieved.  If --force-html is not specified, then
           file should consist of a series of URLs, one per line.

           However, if you specify --force-html, the document will be
           regarded as html.  In that case you may have problems with
           relative links, which you can solve either by adding "<base
           href="url">" to the documents or by specifying --base=url on
           the command line.

           If the file is an external one, the document will be
           automatically treated as html if the Content-Type matches
           text/html.  Furthermore, the file's location will be
           implicitly used as base href if none was specified.

           If the file is a local file, on systems that support it, it
           will be opened with the "O_NONBLOCK" flag to allow
           non-blocking reads from the file. Wget will attempt to
           continue reading from the file until EOF is reached or it is
           closed. This allows one to stream a list of files for
           retrieval where the list is dynamically generated during the
           execution of the process. Currently, this feature is not
           available on Windows platforms.

       --input-metalink=file
           Downloads files covered in local Metalink file. Metalink
           version 3 and 4 are supported.

       --keep-badhash
           Keeps downloaded Metalink's files with a bad hash. It appends
           .badhash to the name of Metalink's files which have a checksum
           mismatch, except without overwriting existing files.

       --metalink-over-http
           Issues HTTP HEAD request instead of GET and extracts Metalink
           metadata from response headers. Then it switches to Metalink
           download.  If no valid Metalink metadata is found, it falls
           back to ordinary HTTP download.  Enables Content-Type:
           application/metalink4+xml files download/processing.

       --metalink-index=number
           Set the Metalink application/metalink4+xml metaurl ordinal
           NUMBER. From 1 to the total number of
           "application/metalink4+xml" available.  Specify 0 or inf to
           choose the first good one.  Metaurls, such as those from a
           --metalink-over-http, may have been sorted by priority key's
           value; keep this in mind to choose the right NUMBER.

       --preferred-location
           Set preferred location for Metalink resources. This has effect
           if multiple resources with same priority are available.

       --xattr
           Enable use of file system's extended attributes to save the
           original URL and the Referer HTTP header value if used.

           Be aware that the URL might contain private information like
           access tokens or credentials.

       -F
       --force-html
           When input is read from a file, force it to be treated as an
           HTML file.  This enables you to retrieve relative links from
           existing HTML files on your local disk, by adding "<base
           href="url">" to HTML, or using the --base command-line option.

       -B URL
       --base=URL
           Resolves relative links using URL as the point of reference,
           when reading links from an HTML file specified via the
           -i/--input-file option (together with --force-html, or when
           the input file was fetched remotely from a server describing
           it as HTML). This is equivalent to the presence of a "BASE"
           tag in the HTML input file, with URL as the value for the
           "href" attribute.

           For instance, if you specify http://foo/bar/a.html for URL,
           and Wget reads ../baz/b.html from the input file, it would be
           resolved to http://foo/baz/b.html .

       --config=FILE
           Specify the location of a startup file you wish to use instead
           of the default one(s). Use --no-config to disable reading of
           config files.  If both --config and --no-config are given,
           --no-config is ignored.

       --rejected-log=logfile
           Logs all URL rejections to logfile as comma separated values.
           The values include the reason of rejection, the URL and the
           parent URL it was found in.

   Download Options
       --bind-address=ADDRESS
           When making client TCP/IP connections, bind to ADDRESS on the
           local machine.  ADDRESS may be specified as a hostname or IP
           address.  This option can be useful if your machine is bound
           to multiple IPs.

       --bind-dns-address=ADDRESS
           [libcares only] This address overrides the route for DNS
           requests. If you ever need to circumvent the standard settings
           from /etc/resolv.conf, this option together with --dns-servers
           is your friend.  ADDRESS must be specified either as IPv4 or
           IPv6 address.  Wget needs to be built with libcares for this
           option to be available.

       --dns-servers=ADDRESSES
           [libcares only] The given address(es) override the standard
           nameserver addresses,  e.g. as configured in /etc/resolv.conf.
           ADDRESSES may be specified either as IPv4 or IPv6 addresses,
           comma-separated.  Wget needs to be built with libcares for
           this option to be available.

       -t number
       --tries=number
           Set number of tries to number. Specify 0 or inf for infinite
           retrying.  The default is to retry 20 times, with the
           exception of fatal errors like "connection refused" or "not
           found" (404), which are not retried.

       -O file
       --output-document=file
           The documents will not be written to the appropriate files,
           but all will be concatenated together and written to file.  If
           - is used as file, documents will be printed to standard
           output, disabling link conversion.  (Use ./- to print to a
           file literally named -.)

           Use of -O is not intended to mean simply "use the name file
           instead of the one in the URL;" rather, it is analogous to
           shell redirection: wget -O file http://foo is intended to work
           like wget -O - http://foo > file; file will be truncated
           immediately, and all downloaded content will be written there.

           For this reason, -N (for timestamp-checking) is not supported
           in combination with -O: since file is always newly created, it
           will always have a very new timestamp. A warning will be
           issued if this combination is used.

           Similarly, using -r or -p with -O may not work as you expect:
           Wget won't just download the first file to file and then
           download the rest to their normal names: all downloaded
           content will be placed in file. This was disabled in version
           1.11, but has been reinstated (with a warning) in 1.11.2, as
           there are some cases where this behavior can actually have
           some use.

           A combination with -nc is only accepted if the given output
           file does not exist.

           Note that a combination with -k is only permitted when
           downloading a single document, as in that case it will just
           convert all relative URIs to external ones; -k makes no sense
           for multiple URIs when they're all being downloaded to a
           single file; -k can be used only when the output is a regular
           file.

       -nc
       --no-clobber
           If a file is downloaded more than once in the same directory,
           Wget's behavior depends on a few options, including -nc.  In
           certain cases, the local file will be clobbered, or
           overwritten, upon repeated download.  In other cases it will
           be preserved.

           When running Wget without -N, -nc, -r, or -p, downloading the
           same file in the same directory will result in the original
           copy of file being preserved and the second copy being named
           file.1.  If that file is downloaded yet again, the third copy
           will be named file.2, and so on.  (This is also the behavior
           with -nd, even if -r or -p are in effect.)  When -nc is
           specified, this behavior is suppressed, and Wget will refuse
           to download newer copies of file.  Therefore, ""no-clobber""
           is actually a misnomer in this mode---it's not clobbering
           that's prevented (as the numeric suffixes were already
           preventing clobbering), but rather the multiple version saving
           that's prevented.

           When running Wget with -r or -p, but without -N, -nd, or -nc,
           re-downloading a file will result in the new copy simply
           overwriting the old.  Adding -nc will prevent this behavior,
           instead causing the original version to be preserved and any
           newer copies on the server to be ignored.

           When running Wget with -N, with or without -r or -p, the
           decision as to whether or not to download a newer copy of a
           file depends on the local and remote timestamp and size of the
           file.  -nc may not be specified at the same time as -N.

           A combination with -O/--output-document is only accepted if
           the given output file does not exist.

           Note that when -nc is specified, files with the suffixes .html
           or .htm will be loaded from the local disk and parsed as if
           they had been retrieved from the Web.

       --backups=backups
           Before (over)writing a file, back up an existing file by
           adding a .1 suffix (_1 on VMS) to the file name.  Such backup
           files are rotated to .2, .3, and so on, up to backups (and
           lost beyond that).

       --no-netrc
           Do not try to obtain credentials from .netrc file. By default
           .netrc file is searched for credentials in case none have been
           passed on command line and authentication is required.

       -c
       --continue
           Continue getting a partially-downloaded file.  This is useful
           when you want to finish up a download started by a previous
           instance of Wget, or by another program.  For instance:

                   wget -c ftp://sunsite.doc.ic.ac.uk/ls-lR.Z

           If there is a file named ls-lR.Z in the current directory,
           Wget will assume that it is the first portion of the remote
           file, and will ask the server to continue the retrieval from
           an offset equal to the length of the local file.

           Note that you don't need to specify this option if you just
           want the current invocation of Wget to retry downloading a
           file should the connection be lost midway through.  This is
           the default behavior.  -c only affects resumption of downloads
           started prior to this invocation of Wget, and whose local
           files are still sitting around.

           Without -c, the previous example would just download the
           remote file to ls-lR.Z.1, leaving the truncated ls-lR.Z file
           alone.

           If you use -c on a non-empty file, and the server does not
           support continued downloading, Wget will restart the download
           from scratch and overwrite the existing file entirely.

           Beginning with Wget 1.7, if you use -c on a file which is of
           equal size as the one on the server, Wget will refuse to
           download the file and print an explanatory message.  The same
           happens when the file is smaller on the server than locally
           (presumably because it was changed on the server since your
           last download attempt)---because "continuing" is not
           meaningful, no download occurs.

           On the other side of the coin, while using -c, any file that's
           bigger on the server than locally will be considered an
           incomplete download and only "(length(remote) -
           length(local))" bytes will be downloaded and tacked onto the
           end of the local file.  This behavior can be desirable in
           certain cases---for instance, you can use wget -c to download
           just the new portion that's been appended to a data collection
           or log file.

           However, if the file is bigger on the server because it's been
           changed, as opposed to just appended to, you'll end up with a
           garbled file.  Wget has no way of verifying that the local
           file is really a valid prefix of the remote file.  You need to
           be especially careful of this when using -c in conjunction
           with -r, since every file will be considered as an "incomplete
           download" candidate.

           Another instance where you'll get a garbled file if you try to
           use -c is if you have a lame HTTP proxy that inserts a
           "transfer interrupted" string into the local file.  In the
           future a "rollback" option may be added to deal with this
           case.

           Note that -c only works with FTP servers and with HTTP servers
           that support the "Range" header.

       --start-pos=OFFSET
           Start downloading at zero-based position OFFSET.  Offset may
           be expressed in bytes, kilobytes with the `k' suffix, or
           megabytes with the `m' suffix, etc.

           --start-pos has higher precedence over --continue.  When
           --start-pos and --continue are both specified, wget will emit
           a warning then proceed as if --continue was absent.

           Server support for continued download is required, otherwise
           --start-pos cannot help.  See -c for details.

       --progress=type
           Select the type of the progress indicator you wish to use.
           Legal indicators are "dot" and "bar".

           The "bar" indicator is used by default.  It draws an ASCII
           progress bar graphics (a.k.a "thermometer" display) indicating
           the status of retrieval.  If the output is not a TTY, the
           "dot" bar will be used by default.

           Use --progress=dot to switch to the "dot" display.  It traces
           the retrieval by printing dots on the screen, each dot
           representing a fixed amount of downloaded data.

           The progress type can also take one or more parameters.  The
           parameters vary based on the type selected.  Parameters to
           type are passed by appending them to the type sperated by a
           colon (:) like this: --progress=type:parameter1:parameter2.

           When using the dotted retrieval, you may set the style by
           specifying the type as dot:style.  Different styles assign
           different meaning to one dot.  With the "default" style each
           dot represents 1K, there are ten dots in a cluster and 50 dots
           in a line.  The "binary" style has a more "computer"-like
           orientation---8K dots, 16-dots clusters and 48 dots per line
           (which makes for 384K lines).  The "mega" style is suitable
           for downloading large files---each dot represents 64K
           retrieved, there are eight dots in a cluster, and 48 dots on
           each line (so each line contains 3M).  If "mega" is not enough
           then you can use the "giga" style---each dot represents 1M
           retrieved, there are eight dots in a cluster, and 32 dots on
           each line (so each line contains 32M).

           With --progress=bar, there are currently two possible
           parameters, force and noscroll.

           When the output is not a TTY, the progress bar always falls
           back to "dot", even if --progress=bar was passed to Wget
           during invocation. This behaviour can be overridden and the
           "bar" output forced by using the "force" parameter as
           --progress=bar:force.

           By default, the bar style progress bar scroll the name of the
           file from left to right for the file being downloaded if the
           filename exceeds the maximum length allotted for its display.
           In certain cases, such as with --progress=bar:force, one may
           not want the scrolling filename in the progress bar.  By
           passing the "noscroll" parameter, Wget can be forced to
           display as much of the filename as possible without scrolling
           through it.

           Note that you can set the default style using the "progress"
           command in .wgetrc.  That setting may be overridden from the
           command line.  For example, to force the bar output without
           scrolling, use --progress=bar:force:noscroll.

       --show-progress
           Force wget to display the progress bar in any verbosity.

           By default, wget only displays the progress bar in verbose
           mode.  One may however, want wget to display the progress bar
           on screen in conjunction with any other verbosity modes like
           --no-verbose or --quiet.  This is often a desired a property
           when invoking wget to download several small/large files.  In
           such a case, wget could simply be invoked with this parameter
           to get a much cleaner output on the screen.

           This option will also force the progress bar to be printed to
           stderr when used alongside the --output-file option.

       -N
       --timestamping
           Turn on time-stamping.

       --no-if-modified-since
           Do not send If-Modified-Since header in -N mode. Send
           preliminary HEAD request instead. This has only effect in -N
           mode.

       --no-use-server-timestamps
           Don't set the local file's timestamp by the one on the server.

           By default, when a file is downloaded, its timestamps are set
           to match those from the remote file. This allows the use of
           --timestamping on subsequent invocations of wget. However, it
           is sometimes useful to base the local file's timestamp on when
           it was actually downloaded; for that purpose, the
           --no-use-server-timestamps option has been provided.

       -S
       --server-response
           Print the headers sent by HTTP servers and responses sent by
           FTP servers.

       --spider
           When invoked with this option, Wget will behave as a Web
           spider, which means that it will not download the pages, just
           check that they are there.  For example, you can use Wget to
           check your bookmarks:

                   wget --spider --force-html -i bookmarks.html

           This feature needs much more work for Wget to get close to the
           functionality of real web spiders.

       -T seconds
       --timeout=seconds
           Set the network timeout to seconds seconds.  This is
           equivalent to specifying --dns-timeout, --connect-timeout, and
           --read-timeout, all at the same time.

           When interacting with the network, Wget can check for timeout
           and abort the operation if it takes too long.  This prevents
           anomalies like hanging reads and infinite connects.  The only
           timeout enabled by default is a 900-second read timeout.
           Setting a timeout to 0 disables it altogether.  Unless you
           know what you are doing, it is best not to change the default
           timeout settings.

           All timeout-related options accept decimal values, as well as
           subsecond values.  For example, 0.1 seconds is a legal (though
           unwise) choice of timeout.  Subsecond timeouts are useful for
           checking server response times or for testing network latency.

       --dns-timeout=seconds
           Set the DNS lookup timeout to seconds seconds.  DNS lookups
           that don't complete within the specified time will fail.  By
           default, there is no timeout on DNS lookups, other than that
           implemented by system libraries.

       --connect-timeout=seconds
           Set the connect timeout to seconds seconds.  TCP connections
           that take longer to establish will be aborted.  By default,
           there is no connect timeout, other than that implemented by
           system libraries.

       --read-timeout=seconds
           Set the read (and write) timeout to seconds seconds.  The
           "time" of this timeout refers to idle time: if, at any point
           in the download, no data is received for more than the
           specified number of seconds, reading fails and the download is
           restarted.  This option does not directly affect the duration
           of the entire download.

           Of course, the remote server may choose to terminate the
           connection sooner than this option requires.  The default read
           timeout is 900 seconds.

       --limit-rate=amount
           Limit the download speed to amount bytes per second.  Amount
           may be expressed in bytes, kilobytes with the k suffix, or
           megabytes with the m suffix.  For example, --limit-rate=20k
           will limit the retrieval rate to 20KB/s.  This is useful when,
           for whatever reason, you don't want Wget to consume the entire
           available bandwidth.

           This option allows the use of decimal numbers, usually in
           conjunction with power suffixes; for example,
           --limit-rate=2.5k is a legal value.

           Note that Wget implements the limiting by sleeping the
           appropriate amount of time after a network read that took less
           time than specified by the rate.  Eventually this strategy
           causes the TCP transfer to slow down to approximately the
           specified rate.  However, it may take some time for this
           balance to be achieved, so don't be surprised if limiting the
           rate doesn't work well with very small files.

       -w seconds
       --wait=seconds
           Wait the specified number of seconds between the retrievals.
           Use of this option is recommended, as it lightens the server
           load by making the requests less frequent.  Instead of in
           seconds, the time can be specified in minutes using the "m"
           suffix, in hours using "h" suffix, or in days using "d"
           suffix.

           Specifying a large value for this option is useful if the
           network or the destination host is down, so that Wget can wait
           long enough to reasonably expect the network error to be fixed
           before the retry.  The waiting interval specified by this
           function is influenced by "--random-wait", which see.

       --waitretry=seconds
           If you don't want Wget to wait between every retrieval, but
           only between retries of failed downloads, you can use this
           option.  Wget will use linear backoff, waiting 1 second after
           the first failure on a given file, then waiting 2 seconds
           after the second failure on that file, up to the maximum
           number of seconds you specify.

           By default, Wget will assume a value of 10 seconds.

       --random-wait
           Some web sites may perform log analysis to identify retrieval
           programs such as Wget by looking for statistically significant
           similarities in the time between requests. This option causes
           the time between requests to vary between 0.5 and 1.5 * wait
           seconds, where wait was specified using the --wait option, in
           order to mask Wget's presence from such analysis.

           A 2001 article in a publication devoted to development on a
           popular consumer platform provided code to perform this
           analysis on the fly.  Its author suggested blocking at the
           class C address level to ensure automated retrieval programs
           were blocked despite changing DHCP-supplied addresses.

           The --random-wait option was inspired by this ill-advised
           recommendation to block many unrelated users from a web site
           due to the actions of one.

       --no-proxy
           Don't use proxies, even if the appropriate *_proxy environment
           variable is defined.

       -Q quota
       --quota=quota
           Specify download quota for automatic retrievals.  The value
           can be specified in bytes (default), kilobytes (with k
           suffix), or megabytes (with m suffix).

           Note that quota will never affect downloading a single file.
           So if you specify wget -Q10k https://example.com/ls-lR.gz, all
           of the ls-lR.gz will be downloaded.  The same goes even when
           several URLs are specified on the command-line.  The quota is
           checked only at the end of each downloaded file, so it will
           never result in a partially downloaded file. Thus you may
           safely type wget -Q2m -i sites---download will be aborted
           after the file that exhausts the quota is completely
           downloaded.

           Setting quota to 0 or to inf unlimits the download quota.

       --no-dns-cache
           Turn off caching of DNS lookups.  Normally, Wget remembers the
           IP addresses it looked up from DNS so it doesn't have to
           repeatedly contact the DNS server for the same (typically
           small) set of hosts it retrieves from.  This cache exists in
           memory only; a new Wget run will contact DNS again.

           However, it has been reported that in some situations it is
           not desirable to cache host names, even for the duration of a
           short-running application like Wget.  With this option Wget
           issues a new DNS lookup (more precisely, a new call to
           "gethostbyname" or "getaddrinfo") each time it makes a new
           connection.  Please note that this option will not affect
           caching that might be performed by the resolving library or by
           an external caching layer, such as NSCD.

           If you don't understand exactly what this option does, you
           probably won't need it.

       --restrict-file-names=modes
           Change which characters found in remote URLs must be escaped
           during generation of local filenames.  Characters that are
           restricted by this option are escaped, i.e. replaced with %HH,
           where HH is the hexadecimal number that corresponds to the
           restricted character. This option may also be used to force
           all alphabetical cases to be either lower- or uppercase.

           By default, Wget escapes the characters that are not valid or
           safe as part of file names on your operating system, as well
           as control characters that are typically unprintable.  This
           option is useful for changing these defaults, perhaps because
           you are downloading to a non-native partition, or because you
           want to disable escaping of the control characters, or you
           want to further restrict characters to only those in the ASCII
           range of values.

           The modes are a comma-separated set of text values. The
           acceptable values are unix, windows, nocontrol, ascii,
           lowercase, and uppercase. The values unix and windows are
           mutually exclusive (one will override the other), as are
           lowercase and uppercase. Those last are special cases, as they
           do not change the set of characters that would be escaped, but
           rather force local file paths to be converted either to lower-
           or uppercase.

           When "unix" is specified, Wget escapes the character / and the
           control characters in the ranges 0--31 and 128--159.  This is
           the default on Unix-like operating systems.

           When "windows" is given, Wget escapes the characters \, |, /,
           :, ?, ", *, <, >, and the control characters in the ranges
           0--31 and 128--159.  In addition to this, Wget in Windows mode
           uses + instead of : to separate host and port in local file
           names, and uses @ instead of ? to separate the query portion
           of the file name from the rest.  Therefore, a URL that would
           be saved as www.xemacs.org:4300/search.pl?input=blah in Unix
           mode would be saved as
           www.xemacs.org+4300/search.pl@input=blah in Windows mode.
           This mode is the default on Windows.

           If you specify nocontrol, then the escaping of the control
           characters is also switched off. This option may make sense
           when you are downloading URLs whose names contain UTF-8
           characters, on a system which can save and display filenames
           in UTF-8 (some possible byte values used in UTF-8 byte
           sequences fall in the range of values designated by Wget as
           "controls").

           The ascii mode is used to specify that any bytes whose values
           are outside the range of ASCII characters (that is, greater
           than 127) shall be escaped. This can be useful when saving
           filenames whose encoding does not match the one used locally.

       -4
       --inet4-only
       -6
       --inet6-only
           Force connecting to IPv4 or IPv6 addresses.  With --inet4-only
           or -4, Wget will only connect to IPv4 hosts, ignoring AAAA
           records in DNS, and refusing to connect to IPv6 addresses
           specified in URLs.  Conversely, with --inet6-only or -6, Wget
           will only connect to IPv6 hosts and ignore A records and IPv4
           addresses.

           Neither options should be needed normally.  By default, an
           IPv6-aware Wget will use the address family specified by the
           host's DNS record.  If the DNS responds with both IPv4 and
           IPv6 addresses, Wget will try them in sequence until it finds
           one it can connect to.  (Also see "--prefer-family" option
           described below.)

           These options can be used to deliberately force the use of
           IPv4 or IPv6 address families on dual family systems, usually
           to aid debugging or to deal with broken network configuration.
           Only one of --inet6-only and --inet4-only may be specified at
           the same time.  Neither option is available in Wget compiled
           without IPv6 support.

       --prefer-family=none/IPv4/IPv6
           When given a choice of several addresses, connect to the
           addresses with specified address family first.  The address
           order returned by DNS is used without change by default.

           This avoids spurious errors and connect attempts when
           accessing hosts that resolve to both IPv6 and IPv4 addresses
           from IPv4 networks.  For example, www.kame.net resolves to
           2001:200:0:8002:203:47ff:fea5:3085 and to 203.178.141.194.
           When the preferred family is "IPv4", the IPv4 address is used
           first; when the preferred family is "IPv6", the IPv6 address
           is used first; if the specified value is "none", the address
           order returned by DNS is used without change.

           Unlike -4 and -6, this option doesn't inhibit access to any
           address family, it only changes the order in which the
           addresses are accessed.  Also note that the reordering
           performed by this option is stable---it doesn't affect order
           of addresses of the same family.  That is, the relative order
           of all IPv4 addresses and of all IPv6 addresses remains intact
           in all cases.

       --retry-connrefused
           Consider "connection refused" a transient error and try again.
           Normally Wget gives up on a URL when it is unable to connect
           to the site because failure to connect is taken as a sign that
           the server is not running at all and that retries would not
           help.  This option is for mirroring unreliable sites whose
           servers tend to disappear for short periods of time.

       --user=user
       --password=password
           Specify the username user and password password for both FTP
           and HTTP file retrieval.  These parameters can be overridden
           using the --ftp-user and --ftp-password options for FTP
           connections and the --http-user and --http-password options
           for HTTP connections.

       --ask-password
           Prompt for a password for each connection established. Cannot
           be specified when --password is being used, because they are
           mutually exclusive.

       --use-askpass=command
           Prompt for a user and password using the specified command.
           If no command is specified then the command in the environment
           variable WGET_ASKPASS is used.  If WGET_ASKPASS is not set
           then the command in the environment variable SSH_ASKPASS is
           used.

           You can set the default command for use-askpass in the
           .wgetrc.  That setting may be overridden from the command
           line.

       --no-iri
           Turn off internationalized URI (IRI) support. Use --iri to
           turn it on. IRI support is activated by default.

           You can set the default state of IRI support using the "iri"
           command in .wgetrc. That setting may be overridden from the
           command line.

       --local-encoding=encoding
           Force Wget to use encoding as the default system encoding.
           That affects how Wget converts URLs specified as arguments
           from locale to UTF-8 for IRI support.

           Wget use the function nl_langinfo() and then the "CHARSET"
           environment variable to get the locale. If it fails, ASCII is
           used.

           You can set the default local encoding using the
           "local_encoding" command in .wgetrc. That setting may be
           overridden from the command line.

       --remote-encoding=encoding
           Force Wget to use encoding as the default remote server
           encoding.  That affects how Wget converts URIs found in files
           from remote encoding to UTF-8 during a recursive fetch. This
           options is only useful for IRI support, for the interpretation
           of non-ASCII characters.

           For HTTP, remote encoding can be found in HTTP "Content-Type"
           header and in HTML "Content-Type http-equiv" meta tag.

           You can set the default encoding using the "remoteencoding"
           command in .wgetrc. That setting may be overridden from the
           command line.

       --unlink
           Force Wget to unlink file instead of clobbering existing file.
           This option is useful for downloading to the directory with
           hardlinks.

   Directory Options
       -nd
       --no-directories
           Do not create a hierarchy of directories when retrieving
           recursively.  With this option turned on, all files will get
           saved to the current directory, without clobbering (if a name
           shows up more than once, the filenames will get extensions
           .n).

       -x
       --force-directories
           The opposite of -nd---create a hierarchy of directories, even
           if one would not have been created otherwise.  E.g. wget -x
           http://fly.srk.fer.hr/robots.txt will save the downloaded file
           to fly.srk.fer.hr/robots.txt.

       -nH
       --no-host-directories
           Disable generation of host-prefixed directories.  By default,
           invoking Wget with -r http://fly.srk.fer.hr/ will create a
           structure of directories beginning with fly.srk.fer.hr/.  This
           option disables such behavior.

       --protocol-directories
           Use the protocol name as a directory component of local file
           names.  For example, with this option, wget -r http://host
           will save to http/host/... rather than just to host/....

       --cut-dirs=number
           Ignore number directory components.  This is useful for
           getting a fine-grained control over the directory where
           recursive retrieval will be saved.

           Take, for example, the directory at
           ftp://ftp.xemacs.org/pub/xemacs/.  If you retrieve it with -r,
           it will be saved locally under ftp.xemacs.org/pub/xemacs/.
           While the -nH option can remove the ftp.xemacs.org/ part, you
           are still stuck with pub/xemacs.  This is where --cut-dirs
           comes in handy; it makes Wget not "see" number remote
           directory components.  Here are several examples of how
           --cut-dirs option works.

                   No options        -> ftp.xemacs.org/pub/xemacs/
                   -nH               -> pub/xemacs/
                   -nH --cut-dirs=1  -> xemacs/
                   -nH --cut-dirs=2  -> .

                   --cut-dirs=1      -> ftp.xemacs.org/xemacs/
                   ...

           If you just want to get rid of the directory structure, this
           option is similar to a combination of -nd and -P.  However,
           unlike -nd, --cut-dirs does not lose with subdirectories---for
           instance, with -nH --cut-dirs=1, a beta/ subdirectory will be
           placed to xemacs/beta, as one would expect.

       -P prefix
       --directory-prefix=prefix
           Set directory prefix to prefix.  The directory prefix is the
           directory where all other files and subdirectories will be
           saved to, i.e. the top of the retrieval tree.  The default is
           . (the current directory).

   HTTP Options
       --default-page=name
           Use name as the default file name when it isn't known (i.e.,
           for URLs that end in a slash), instead of index.html.

       -E
       --adjust-extension
           If a file of type application/xhtml+xml or text/html is
           downloaded and the URL does not end with the regexp
           \.[Hh][Tt][Mm][Ll]?, this option will cause the suffix .html
           to be appended to the local filename.  This is useful, for
           instance, when you're mirroring a remote site that uses .asp
           pages, but you want the mirrored pages to be viewable on your
           stock Apache server.  Another good use for this is when you're
           downloading CGI-generated materials.  A URL like
           http://site.com/article.cgi?25 will be saved as
           article.cgi?25.html.

           Note that filenames changed in this way will be re-downloaded
           every time you re-mirror a site, because Wget can't tell that
           the local X.html file corresponds to remote URL X (since it
           doesn't yet know that the URL produces output of type
           text/html or application/xhtml+xml.

           As of version 1.12, Wget will also ensure that any downloaded
           files of type text/css end in the suffix .css, and the option
           was renamed from --html-extension, to better reflect its new
           behavior. The old option name is still acceptable, but should
           now be considered deprecated.

           As of version 1.19.2, Wget will also ensure that any
           downloaded files with a "Content-Encoding" of br, compress,
           deflate or gzip end in the suffix .br, .Z, .zlib and .gz
           respectively.

           At some point in the future, this option may well be expanded
           to include suffixes for other types of content, including
           content types that are not parsed by Wget.

       --http-user=user
       --http-password=password
           Specify the username user and password password on an HTTP
           server.  According to the type of the challenge, Wget will
           encode them using either the "basic" (insecure), the "digest",
           or the Windows "NTLM" authentication scheme.

           Another way to specify username and password is in the URL
           itself.  Either method reveals your password to anyone who
           bothers to run "ps".  To prevent the passwords from being
           seen, use the --use-askpass or store them in .wgetrc or
           .netrc, and make sure to protect those files from other users
           with "chmod".  If the passwords are really important, do not
           leave them lying in those files either---edit the files and
           delete them after Wget has started the download.

       --no-http-keep-alive
           Turn off the "keep-alive" feature for HTTP downloads.
           Normally, Wget asks the server to keep the connection open so
           that, when you download more than one document from the same
           server, they get transferred over the same TCP connection.
           This saves time and at the same time reduces the load on the
           server.

           This option is useful when, for some reason, persistent
           (keep-alive) connections don't work for you, for example due
           to a server bug or due to the inability of server-side scripts
           to cope with the connections.

       --no-cache
           Disable server-side cache.  In this case, Wget will send the
           remote server appropriate directives (Cache-Control: no-cache
           and Pragma: no-cache) to get the file from the remote service,
           rather than returning the cached version. This is especially
           useful for retrieving and flushing out-of-date documents on
           proxy servers.

           Caching is allowed by default.

       --no-cookies
           Disable the use of cookies.  Cookies are a mechanism for
           maintaining server-side state.  The server sends the client a
           cookie using the "Set-Cookie" header, and the client responds
           with the same cookie upon further requests.  Since cookies
           allow the server owners to keep track of visitors and for
           sites to exchange this information, some consider them a
           breach of privacy.  The default is to use cookies; however,
           storing cookies is not on by default.

       --load-cookies file
           Load cookies from file before the first HTTP retrieval.  file
           is a textual file in the format originally used by Netscape's
           cookies.txt file.

           You will typically use this option when mirroring sites that
           require that you be logged in to access some or all of their
           content.  The login process typically works by the web server
           issuing an HTTP cookie upon receiving and verifying your
           credentials.  The cookie is then resent by the browser when
           accessing that part of the site, and so proves your identity.

           Mirroring such a site requires Wget to send the same cookies
           your browser sends when communicating with the site.  This is
           achieved by --load-cookies---simply point Wget to the location
           of the cookies.txt file, and it will send the same cookies
           your browser would send in the same situation.  Different
           browsers keep textual cookie files in different locations:

           "Netscape 4.x."
               The cookies are in ~/.netscape/cookies.txt.

           "Mozilla and Netscape 6.x."
               Mozilla's cookie file is also named cookies.txt, located
               somewhere under ~/.mozilla, in the directory of your
               profile.  The full path usually ends up looking somewhat
               like ~/.mozilla/default/some-weird-string/cookies.txt.

           "Internet Explorer."
               You can produce a cookie file Wget can use by using the
               File menu, Import and Export, Export Cookies.  This has
               been tested with Internet Explorer 5; it is not guaranteed
               to work with earlier versions.

           "Other browsers."
               If you are using a different browser to create your
               cookies, --load-cookies will only work if you can locate
               or produce a cookie file in the Netscape format that Wget
               expects.

           If you cannot use --load-cookies, there might still be an
           alternative.  If your browser supports a "cookie manager", you
           can use it to view the cookies used when accessing the site
           you're mirroring.  Write down the name and value of the
           cookie, and manually instruct Wget to send those cookies,
           bypassing the "official" cookie support:

                   wget --no-cookies --header "Cookie: <name>=<value>"

       --save-cookies file
           Save cookies to file before exiting.  This will not save
           cookies that have expired or that have no expiry time
           (so-called "session cookies"), but also see
           --keep-session-cookies.

       --keep-session-cookies
           When specified, causes --save-cookies to also save session
           cookies.  Session cookies are normally not saved because they
           are meant to be kept in memory and forgotten when you exit the
           browser.  Saving them is useful on sites that require you to
           log in or to visit the home page before you can access some
           pages.  With this option, multiple Wget runs are considered a
           single browser session as far as the site is concerned.

           Since the cookie file format does not normally carry session
           cookies, Wget marks them with an expiry timestamp of 0.
           Wget's --load-cookies recognizes those as session cookies, but
           it might confuse other browsers.  Also note that cookies so
           loaded will be treated as other session cookies, which means
           that if you want --save-cookies to preserve them again, you
           must use --keep-session-cookies again.

       --ignore-length
           Unfortunately, some HTTP servers (CGI programs, to be more
           precise) send out bogus "Content-Length" headers, which makes
           Wget go wild, as it thinks not all the document was retrieved.
           You can spot this syndrome if Wget retries getting the same
           document again and again, each time claiming that the
           (otherwise normal) connection has closed on the very same
           byte.

           With this option, Wget will ignore the "Content-Length"
           header---as if it never existed.

       --header=header-line
           Send header-line along with the rest of the headers in each
           HTTP request.  The supplied header is sent as-is, which means
           it must contain name and value separated by colon, and must
           not contain newlines.

           You may define more than one additional header by specifying
           --header more than once.

                   wget --header='Accept-Charset: iso-8859-2' \
                        --header='Accept-Language: hr'        \
                          http://fly.srk.fer.hr/

           Specification of an empty string as the header value will
           clear all previous user-defined headers.

           As of Wget 1.10, this option can be used to override headers
           otherwise generated automatically.  This example instructs
           Wget to connect to localhost, but to specify foo.bar in the
           "Host" header:

                   wget --header="Host: foo.bar" http://localhost/

           In versions of Wget prior to 1.10 such use of --header caused
           sending of duplicate headers.

       --compression=type
           Choose the type of compression to be used.  Legal values are
           auto, gzip and none.

           If auto or gzip are specified, Wget asks the server to
           compress the file using the gzip compression format. If the
           server compresses the file and responds with the
           "Content-Encoding" header field set appropriately, the file
           will be decompressed automatically.

           If none is specified, wget will not ask the server to compress
           the file and will not decompress any server responses. This is
           the default.

           Compression support is currently experimental. In case it is
           turned on, please report any bugs to "bug-wget@gnu.org".

       --max-redirect=number
           Specifies the maximum number of redirections to follow for a
           resource.  The default is 20, which is usually far more than
           necessary. However, on those occasions where you want to allow
           more (or fewer), this is the option to use.

       --proxy-user=user
       --proxy-password=password
           Specify the username user and password password for
           authentication on a proxy server.  Wget will encode them using
           the "basic" authentication scheme.

           Security considerations similar to those with --http-password
           pertain here as well.

       --referer=url
           Include `Referer: url' header in HTTP request.  Useful for
           retrieving documents with server-side processing that assume
           they are always being retrieved by interactive web browsers
           and only come out properly when Referer is set to one of the
           pages that point to them.

       --save-headers
           Save the headers sent by the HTTP server to the file,
           preceding the actual contents, with an empty line as the
           separator.

       -U agent-string
       --user-agent=agent-string
           Identify as agent-string to the HTTP server.

           The HTTP protocol allows the clients to identify themselves
           using a "User-Agent" header field.  This enables
           distinguishing the WWW software, usually for statistical
           purposes or for tracing of protocol violations.  Wget normally
           identifies as Wget/version, version being the current version
           number of Wget.

           However, some sites have been known to impose the policy of
           tailoring the output according to the "User-Agent"-supplied
           information.  While this is not such a bad idea in theory, it
           has been abused by servers denying information to clients
           other than (historically) Netscape or, more frequently,
           Microsoft Internet Explorer.  This option allows you to change
           the "User-Agent" line issued by Wget.  Use of this option is
           discouraged, unless you really know what you are doing.

           Specifying empty user agent with --user-agent="" instructs
           Wget not to send the "User-Agent" header in HTTP requests.

       --post-data=string
       --post-file=file
           Use POST as the method for all HTTP requests and send the
           specified data in the request body.  --post-data sends string
           as data, whereas --post-file sends the contents of file.
           Other than that, they work in exactly the same way. In
           particular, they both expect content of the form
           "key1=value1&key2=value2", with percent-encoding for special
           characters; the only difference is that one expects its
           content as a command-line parameter and the other accepts its
           content from a file. In particular, --post-file is not for
           transmitting files as form attachments: those must appear as
           "key=value" data (with appropriate percent-coding) just like
           everything else. Wget does not currently support
           "multipart/form-data" for transmitting POST data; only
           "application/x-www-form-urlencoded". Only one of --post-data
           and --post-file should be specified.

           Please note that wget does not require the content to be of
           the form "key1=value1&key2=value2", and neither does it test
           for it. Wget will simply transmit whatever data is provided to
           it. Most servers however expect the POST data to be in the
           above format when processing HTML Forms.

           When sending a POST request using the --post-file option, Wget
           treats the file as a binary file and will send every character
           in the POST request without stripping trailing newline or
           formfeed characters. Any other control characters in the text
           will also be sent as-is in the POST request.

           Please be aware that Wget needs to know the size of the POST
           data in advance.  Therefore the argument to "--post-file" must
           be a regular file; specifying a FIFO or something like
           /dev/stdin won't work.  It's not quite clear how to work
           around this limitation inherent in HTTP/1.0.  Although
           HTTP/1.1 introduces chunked transfer that doesn't require
           knowing the request length in advance, a client can't use
           chunked unless it knows it's talking to an HTTP/1.1 server.
           And it can't know that until it receives a response, which in
           turn requires the request to have been completed -- a
           chicken-and-egg problem.

           Note: As of version 1.15 if Wget is redirected after the POST
           request is completed, its behaviour will depend on the
           response code returned by the server.  In case of a 301 Moved
           Permanently, 302 Moved Temporarily or 307 Temporary Redirect,
           Wget will, in accordance with RFC2616, continue to send a POST
           request.  In case a server wants the client to change the
           Request method upon redirection, it should send a 303 See
           Other response code.

           This example shows how to log in to a server using POST and
           then proceed to download the desired pages, presumably only
           accessible to authorized users:

                   # Log in to the server.  This can be done only once.
                   wget --save-cookies cookies.txt \
                        --post-data 'user=foo&password=bar' \
                        http://example.com/auth.php

                   # Now grab the page or pages we care about.
                   wget --load-cookies cookies.txt \
                        -p http://example.com/interesting/article.php

           If the server is using session cookies to track user
           authentication, the above will not work because --save-cookies
           will not save them (and neither will browsers) and the
           cookies.txt file will be empty.  In that case use
           --keep-session-cookies along with --save-cookies to force
           saving of session cookies.

       --method=HTTP-Method
           For the purpose of RESTful scripting, Wget allows sending of
           other HTTP Methods without the need to explicitly set them
           using --header=Header-Line.  Wget will use whatever string is
           passed to it after --method as the HTTP Method to the server.

       --body-data=Data-String
       --body-file=Data-File
           Must be set when additional data needs to be sent to the
           server along with the Method specified using --method.
           --body-data sends string as data, whereas --body-file sends
           the contents of file.  Other than that, they work in exactly
           the same way.

           Currently, --body-file is not for transmitting files as a
           whole.  Wget does not currently support "multipart/form-data"
           for transmitting data; only
           "application/x-www-form-urlencoded". In the future, this may
           be changed so that wget sends the --body-file as a complete
           file instead of sending its contents to the server. Please be
           aware that Wget needs to know the contents of BODY Data in
           advance, and hence the argument to --body-file should be a
           regular file. See --post-file for a more detailed explanation.
           Only one of --body-data and --body-file should be specified.

           If Wget is redirected after the request is completed, Wget
           will suspend the current method and send a GET request till
           the redirection is completed.  This is true for all
           redirection response codes except 307 Temporary Redirect which
           is used to explicitly specify that the request method should
           not change.  Another exception is when the method is set to
           "POST", in which case the redirection rules specified under
           --post-data are followed.

       --content-disposition
           If this is set to on, experimental (not fully-functional)
           support for "Content-Disposition" headers is enabled. This can
           currently result in extra round-trips to the server for a
           "HEAD" request, and is known to suffer from a few bugs, which
           is why it is not currently enabled by default.

           This option is useful for some file-downloading CGI programs
           that use "Content-Disposition" headers to describe what the
           name of a downloaded file should be.

           When combined with --metalink-over-http and
           --trust-server-names, a Content-Type:
           application/metalink4+xml file is named using the
           "Content-Disposition" filename field, if available.

       --content-on-error
           If this is set to on, wget will not skip the content when the
           server responds with a http status code that indicates error.

       --trust-server-names
           If this is set, on a redirect, the local file name will be
           based on the redirection URL.  By default the local file name
           is based on the original URL.  When doing recursive retrieving
           this can be helpful because in many web sites redirected URLs
           correspond to an underlying file structure, while link URLs do
           not.

       --auth-no-challenge
           If this option is given, Wget will send Basic HTTP
           authentication information (plaintext username and password)
           for all requests, just like Wget 1.10.2 and prior did by
           default.

           Use of this option is not recommended, and is intended only to
           support some few obscure servers, which never send HTTP
           authentication challenges, but accept unsolicited auth info,
           say, in addition to form-based authentication.

       --retry-on-host-error
           Consider host errors, such as "Temporary failure in name
           resolution", as non-fatal, transient errors.

       --retry-on-http-error=code[,code,...]
           Consider given HTTP response codes as non-fatal, transient
           errors.  Supply a comma-separated list of 3-digit HTTP
           response codes as argument. Useful to work around special
           circumstances where retries are required, but the server
           responds with an error code normally not retried by Wget. Such
           errors might be 503 (Service Unavailable) and 429 (Too Many
           Requests). Retries enabled by this option are performed
           subject to the normal retry timing and retry count limitations
           of Wget.

           Using this option is intended to support special use cases
           only and is generally not recommended, as it can force retries
           even in cases where the server is actually trying to decrease
           its load. Please use wisely and only if you know what you are
           doing.

   HTTPS (SSL/TLS) Options
       To support encrypted HTTP (HTTPS) downloads, Wget must be compiled
       with an external SSL library. The current default is GnuTLS.  In
       addition, Wget also supports HSTS (HTTP Strict Transport
       Security).  If Wget is compiled without SSL support, none of these
       options are available.

       --secure-protocol=protocol
           Choose the secure protocol to be used.  Legal values are auto,
           SSLv2, SSLv3, TLSv1, TLSv1_1, TLSv1_2, TLSv1_3 and PFS.  If
           auto is used, the SSL library is given the liberty of choosing
           the appropriate protocol automatically, which is achieved by
           sending a TLSv1 greeting. This is the default.

           Specifying SSLv2, SSLv3, TLSv1, TLSv1_1, TLSv1_2 or TLSv1_3
           forces the use of the corresponding protocol.  This is useful
           when talking to old and buggy SSL server implementations that
           make it hard for the underlying SSL library to choose the
           correct protocol version.  Fortunately, such servers are quite
           rare.

           Specifying PFS enforces the use of the so-called Perfect
           Forward Security cipher suites. In short, PFS adds security by
           creating a one-time key for each SSL connection. It has a bit
           more CPU impact on client and server.  We use known to be
           secure ciphers (e.g. no MD4) and the TLS protocol. This mode
           also explicitly excludes non-PFS key exchange methods, such as
           RSA.

       --https-only
           When in recursive mode, only HTTPS links are followed.

       --ciphers
           Set the cipher list string. Typically this string sets the
           cipher suites and other SSL/TLS options that the user wish
           should be used, in a set order of preference (GnuTLS calls it
           'priority string'). This string will be fed verbatim to the
           SSL/TLS engine (OpenSSL or GnuTLS) and hence its format and
           syntax is dependent on that. Wget will not process or
           manipulate it in any way. Refer to the OpenSSL or GnuTLS
           documentation for more information.

       --no-check-certificate
           Don't check the server certificate against the available
           certificate authorities.  Also don't require the URL host name
           to match the common name presented by the certificate.

           As of Wget 1.10, the default is to verify the server's
           certificate against the recognized certificate authorities,
           breaking the SSL handshake and aborting the download if the
           verification fails.  Although this provides more secure
           downloads, it does break interoperability with some sites that
           worked with previous Wget versions, particularly those using
           self-signed, expired, or otherwise invalid certificates.  This
           option forces an "insecure" mode of operation that turns the
           certificate verification errors into warnings and allows you
           to proceed.

           If you encounter "certificate verification" errors or ones
           saying that "common name doesn't match requested host name",
           you can use this option to bypass the verification and proceed
           with the download.  Only use this option if you are otherwise
           convinced of the site's authenticity, or if you really don't
           care about the validity of its certificate.  It is almost
           always a bad idea not to check the certificates when
           transmitting confidential or important data.  For
           self-signed/internal certificates, you should download the
           certificate and verify against that instead of forcing this
           insecure mode.  If you are really sure of not desiring any
           certificate verification, you can specify
           --check-certificate=quiet to tell wget to not print any
           warning about invalid certificates, albeit in most cases this
           is the wrong thing to do.

       --certificate=file
           Use the client certificate stored in file.  This is needed for
           servers that are configured to require certificates from the
           clients that connect to them.  Normally a certificate is not
           required and this switch is optional.

       --certificate-type=type
           Specify the type of the client certificate.  Legal values are
           PEM (assumed by default) and DER, also known as ASN1.

       --private-key=file
           Read the private key from file.  This allows you to provide
           the private key in a file separate from the certificate.

       --private-key-type=type
           Specify the type of the private key.  Accepted values are PEM
           (the default) and DER.

       --ca-certificate=file
           Use file as the file with the bundle of certificate
           authorities ("CA") to verify the peers.  The certificates must
           be in PEM format.

           Without this option Wget looks for CA certificates at the
           system-specified locations, chosen at OpenSSL installation
           time.

       --ca-directory=directory
           Specifies directory containing CA certificates in PEM format.
           Each file contains one CA certificate, and the file name is
           based on a hash value derived from the certificate.  This is
           achieved by processing a certificate directory with the
           "c_rehash" utility supplied with OpenSSL.  Using
           --ca-directory is more efficient than --ca-certificate when
           many certificates are installed because it allows Wget to
           fetch certificates on demand.

           Without this option Wget looks for CA certificates at the
           system-specified locations, chosen at OpenSSL installation
           time.

       --crl-file=file
           Specifies a CRL file in file.  This is needed for certificates
           that have been revocated by the CAs.

       --pinnedpubkey=file/hashes
           Tells wget to use the specified public key file (or hashes) to
           verify the peer.  This can be a path to a file which contains
           a single public key in PEM or DER format, or any number of
           base64 encoded sha256 hashes preceded by "sha256//" and
           separated by ";"

           When negotiating a TLS or SSL connection, the server sends a
           certificate indicating its identity. A public key is extracted
           from this certificate and if it does not exactly match the
           public key(s) provided to this option, wget will abort the
           connection before sending or receiving any data.

       --random-file=file
           [OpenSSL and LibreSSL only] Use file as the source of random
           data for seeding the pseudo-random number generator on systems
           without /dev/urandom.

           On such systems the SSL library needs an external source of
           randomness to initialize.  Randomness may be provided by EGD
           (see --egd-file below) or read from an external source
           specified by the user.  If this option is not specified, Wget
           looks for random data in $RANDFILE or, if that is unset, in
           $HOME/.rnd.

           If you're getting the "Could not seed OpenSSL PRNG; disabling
           SSL."  error, you should provide random data using some of the
           methods described above.

       --egd-file=file
           [OpenSSL only] Use file as the EGD socket.  EGD stands for
           Entropy Gathering Daemon, a user-space program that collects
           data from various unpredictable system sources and makes it
           available to other programs that might need it.  Encryption
           software, such as the SSL library, needs sources of
           non-repeating randomness to seed the random number generator
           used to produce cryptographically strong keys.

           OpenSSL allows the user to specify his own source of entropy
           using the "RAND_FILE" environment variable.  If this variable
           is unset, or if the specified file does not produce enough
           randomness, OpenSSL will read random data from EGD socket
           specified using this option.

           If this option is not specified (and the equivalent startup
           command is not used), EGD is never contacted.  EGD is not
           needed on modern Unix systems that support /dev/urandom.

       --no-hsts
           Wget supports HSTS (HTTP Strict Transport Security, RFC 6797)
           by default.  Use --no-hsts to make Wget act as a
           non-HSTS-compliant UA. As a consequence, Wget would ignore all
           the "Strict-Transport-Security" headers, and would not enforce
           any existing HSTS policy.

       --hsts-file=file
           By default, Wget stores its HSTS database in ~/.wget-hsts.
           You can use --hsts-file to override this. Wget will use the
           supplied file as the HSTS database. Such file must conform to
           the correct HSTS database format used by Wget. If Wget cannot
           parse the provided file, the behaviour is unspecified.

           The Wget's HSTS database is a plain text file. Each line
           contains an HSTS entry (ie. a site that has issued a
           "Strict-Transport-Security" header and that therefore has
           specified a concrete HSTS policy to be applied). Lines
           starting with a dash ("#") are ignored by Wget. Please note
           that in spite of this convenient human-readability
           hand-hacking the HSTS database is generally not a good idea.

           An HSTS entry line consists of several fields separated by one
           or more whitespace:

           "<hostname> SP [<port>] SP <include subdomains> SP <created>
           SP <max-age>"

           The hostname and port fields indicate the hostname and port to
           which the given HSTS policy applies. The port field may be
           zero, and it will, in most of the cases. That means that the
           port number will not be taken into account when deciding
           whether such HSTS policy should be applied on a given request
           (only the hostname will be evaluated). When port is different
           to zero, both the target hostname and the port will be
           evaluated and the HSTS policy will only be applied if both of
           them match. This feature has been included for
           testing/development purposes only.  The Wget testsuite (in
           testenv/) creates HSTS databases with explicit ports with the
           purpose of ensuring Wget's correct behaviour. Applying HSTS
           policies to ports other than the default ones is discouraged
           by RFC 6797 (see Appendix B "Differences between HSTS Policy
           and Same-Origin Policy"). Thus, this functionality should not
           be used in production environments and port will typically be
           zero. The last three fields do what they are expected to. The
           field include_subdomains can either be 1 or 0 and it signals
           whether the subdomains of the target domain should be part of
           the given HSTS policy as well. The created and max-age fields
           hold the timestamp values of when such entry was created
           (first seen by Wget) and the HSTS-defined value 'max-age',
           which states how long should that HSTS policy remain active,
           measured in seconds elapsed since the timestamp stored in
           created. Once that time has passed, that HSTS policy will no
           longer be valid and will eventually be removed from the
           database.

           If you supply your own HSTS database via --hsts-file, be aware
           that Wget may modify the provided file if any change occurs
           between the HSTS policies requested by the remote servers and
           those in the file. When Wget exits, it effectively updates the
           HSTS database by rewriting the database file with the new
           entries.

           If the supplied file does not exist, Wget will create one.
           This file will contain the new HSTS entries. If no HSTS
           entries were generated (no "Strict-Transport-Security" headers
           were sent by any of the servers) then no file will be created,
           not even an empty one. This behaviour applies to the default
           database file (~/.wget-hsts) as well: it will not be created
           until some server enforces an HSTS policy.

           Care is taken not to override possible changes made by other
           Wget processes at the same time over the HSTS database. Before
           dumping the updated HSTS entries on the file, Wget will
           re-read it and merge the changes.

           Using a custom HSTS database and/or modifying an existing one
           is discouraged.  For more information about the potential
           security threats arose from such practice, see section 14
           "Security Considerations" of RFC 6797, specially section 14.9
           "Creative Manipulation of HSTS Policy Store".

       --warc-file=file
           Use file as the destination WARC file.

       --warc-header=string
           Use string into as the warcinfo record.

       --warc-max-size=size
           Set the maximum size of the WARC files to size.

       --warc-cdx
           Write CDX index files.

       --warc-dedup=file
           Do not store records listed in this CDX file.

       --no-warc-compression
           Do not compress WARC files with GZIP.

       --no-warc-digests
           Do not calculate SHA1 digests.

       --no-warc-keep-log
           Do not store the log file in a WARC record.

       --warc-tempdir=dir
           Specify the location for temporary files created by the WARC
           writer.

   FTP Options
       --ftp-user=user
       --ftp-password=password
           Specify the username user and password password on an FTP
           server.  Without this, or the corresponding startup option,
           the password defaults to -wget@, normally used for anonymous
           FTP.

           Another way to specify username and password is in the URL
           itself.  Either method reveals your password to anyone who
           bothers to run "ps".  To prevent the passwords from being
           seen, store them in .wgetrc or .netrc, and make sure to
           protect those files from other users with "chmod".  If the
           passwords are really important, do not leave them lying in
           those files either---edit the files and delete them after Wget
           has started the download.

       --no-remove-listing
           Don't remove the temporary .listing files generated by FTP
           retrievals.  Normally, these files contain the raw directory
           listings received from FTP servers.  Not removing them can be
           useful for debugging purposes, or when you want to be able to
           easily check on the contents of remote server directories
           (e.g. to verify that a mirror you're running is complete).

           Note that even though Wget writes to a known filename for this
           file, this is not a security hole in the scenario of a user
           making .listing a symbolic link to /etc/passwd or something
           and asking "root" to run Wget in his or her directory.
           Depending on the options used, either Wget will refuse to
           write to .listing, making the globbing/recursion/time-stamping
           operation fail, or the symbolic link will be deleted and
           replaced with the actual .listing file, or the listing will be
           written to a .listing.number file.

           Even though this situation isn't a problem, though, "root"
           should never run Wget in a non-trusted user's directory.  A
           user could do something as simple as linking index.html to
           /etc/passwd and asking "root" to run Wget with -N or -r so the
           file will be overwritten.

       --no-glob
           Turn off FTP globbing.  Globbing refers to the use of
           shell-like special characters (wildcards), like *, ?, [ and ]
           to retrieve more than one file from the same directory at
           once, like:

                   wget ftp://gnjilux.srk.fer.hr/*.msg

           By default, globbing will be turned on if the URL contains a
           globbing character.  This option may be used to turn globbing
           on or off permanently.

           You may have to quote the URL to protect it from being
           expanded by your shell.  Globbing makes Wget look for a
           directory listing, which is system-specific.  This is why it
           currently works only with Unix FTP servers (and the ones
           emulating Unix "ls" output).

       --no-passive-ftp
           Disable the use of the passive FTP transfer mode.  Passive FTP
           mandates that the client connect to the server to establish
           the data connection rather than the other way around.

           If the machine is connected to the Internet directly, both
           passive and active FTP should work equally well.  Behind most
           firewall and NAT configurations passive FTP has a better
           chance of working.  However, in some rare firewall
           configurations, active FTP actually works when passive FTP
           doesn't.  If you suspect this to be the case, use this option,
           or set "passive_ftp=off" in your init file.

       --preserve-permissions
           Preserve remote file permissions instead of permissions set by
           umask.

       --retr-symlinks
           By default, when retrieving FTP directories recursively and a
           symbolic link is encountered, the symbolic link is traversed
           and the pointed-to files are retrieved.  Currently, Wget does
           not traverse symbolic links to directories to download them
           recursively, though this feature may be added in the future.

           When --retr-symlinks=no is specified, the linked-to file is
           not downloaded.  Instead, a matching symbolic link is created
           on the local file system.  The pointed-to file will not be
           retrieved unless this recursive retrieval would have
           encountered it separately and downloaded it anyway.  This
           option poses a security risk where a malicious FTP Server may
           cause Wget to write to files outside of the intended
           directories through a specially crafted .LISTING file.

           Note that when retrieving a file (not a directory) because it
           was specified on the command-line, rather than because it was
           recursed to, this option has no effect.  Symbolic links are
           always traversed in this case.

   FTPS Options
       --ftps-implicit
           This option tells Wget to use FTPS implicitly. Implicit FTPS
           consists of initializing SSL/TLS from the very beginning of
           the control connection. This option does not send an "AUTH
           TLS" command: it assumes the server speaks FTPS and directly
           starts an SSL/TLS connection. If the attempt is successful,
           the session continues just like regular FTPS ("PBSZ" and
           "PROT" are sent, etc.).  Implicit FTPS is no longer a
           requirement for FTPS implementations, and thus many servers
           may not support it. If --ftps-implicit is passed and no
           explicit port number specified, the default port for implicit
           FTPS, 990, will be used, instead of the default port for the
           "normal" (explicit) FTPS which is the same as that of FTP, 21.

       --no-ftps-resume-ssl
           Do not resume the SSL/TLS session in the data channel. When
           starting a data connection, Wget tries to resume the SSL/TLS
           session previously started in the control connection.  SSL/TLS
           session resumption avoids performing an entirely new handshake
           by reusing the SSL/TLS parameters of a previous session.
           Typically, the FTPS servers want it that way, so Wget does
           this by default. Under rare circumstances however, one might
           want to start an entirely new SSL/TLS session in every data
           connection.  This is what --no-ftps-resume-ssl is for.

       --ftps-clear-data-connection
           All the data connections will be in plain text. Only the
           control connection will be under SSL/TLS. Wget will send a
           "PROT C" command to achieve this, which must be approved by
           the server.

       --ftps-fallback-to-ftp
           Fall back to FTP if FTPS is not supported by the target
           server. For security reasons, this option is not asserted by
           default. The default behaviour is to exit with an error.  If a
           server does not successfully reply to the initial "AUTH TLS"
           command, or in the case of implicit FTPS, if the initial
           SSL/TLS connection attempt is rejected, it is considered that
           such server does not support FTPS.

   Recursive Retrieval Options
       -r
       --recursive
           Turn on recursive retrieving.    The default maximum depth is
           5.

       -l depth
       --level=depth
           Set the maximum number of subdirectories that Wget will
           recurse into to depth.  In order to prevent one from
           accidentally downloading very large websites when using
           recursion this is limited to a depth of 5 by default, i.e., it
           will traverse at most 5 directories deep starting from the
           provided URL.  Set -l 0 or -l inf for infinite recursion
           depth.

                   wget -r -l 0 http://<site>/1.html

           Ideally, one would expect this to download just 1.html.  but
           unfortunately this is not the case, because -l 0 is equivalent
           to -l inf---that is, infinite recursion.  To download a single
           HTML page (or a handful of them), specify them all on the
           command line and leave away -r and -l. To download the
           essential items to view a single HTML page, see page
           requisites.

       --delete-after
           This option tells Wget to delete every single file it
           downloads, after having done so.  It is useful for
           pre-fetching popular pages through a proxy, e.g.:

                   wget -r -nd --delete-after http://whatever.com/~popular/page/

           The -r option is to retrieve recursively, and -nd to not
           create directories.

           Note that --delete-after deletes files on the local machine.
           It does not issue the DELE command to remote FTP sites, for
           instance.  Also note that when --delete-after is specified,
           --convert-links is ignored, so .orig files are simply not
           created in the first place.

       -k
       --convert-links
           After the download is complete, convert the links in the
           document to make them suitable for local viewing.  This
           affects not only the visible hyperlinks, but any part of the
           document that links to external content, such as embedded
           images, links to style sheets, hyperlinks to non-HTML content,
           etc.

           Each link will be changed in one of the two ways:

           •   The links to files that have been downloaded by Wget will
               be changed to refer to the file they point to as a
               relative link.

               Example: if the downloaded file /foo/doc.html links to
               /bar/img.gif, also downloaded, then the link in doc.html
               will be modified to point to ../bar/img.gif.  This kind of
               transformation works reliably for arbitrary combinations
               of directories.

           •   The links to files that have not been downloaded by Wget
               will be changed to include host name and absolute path of
               the location they point to.

               Example: if the downloaded file /foo/doc.html links to
               /bar/img.gif (or to ../bar/img.gif), then the link in
               doc.html will be modified to point to
               http://hostname/bar/img.gif .

           Because of this, local browsing works reliably: if a linked
           file was downloaded, the link will refer to its local name; if
           it was not downloaded, the link will refer to its full
           Internet address rather than presenting a broken link.  The
           fact that the former links are converted to relative links
           ensures that you can move the downloaded hierarchy to another
           directory.

           Note that only at the end of the download can Wget know which
           links have been downloaded.  Because of that, the work done by
           -k will be performed at the end of all the downloads.

       --convert-file-only
           This option converts only the filename part of the URLs,
           leaving the rest of the URLs untouched. This filename part is
           sometimes referred to as the "basename", although we avoid
           that term here in order not to cause confusion.

           It works particularly well in conjunction with
           --adjust-extension, although this coupling is not enforced. It
           proves useful to populate Internet caches with files
           downloaded from different hosts.

           Example: if some link points to //foo.com/bar.cgi?xyz with
           --adjust-extension asserted and its local destination is
           intended to be ./foo.com/bar.cgi?xyz.css, then the link would
           be converted to //foo.com/bar.cgi?xyz.css. Note that only the
           filename part has been modified. The rest of the URL has been
           left untouched, including the net path ("//") which would
           otherwise be processed by Wget and converted to the effective
           scheme (ie. "http://").

       -K
       --backup-converted
           When converting a file, back up the original version with a
           .orig suffix.  Affects the behavior of -N.

       -m
       --mirror
           Turn on options suitable for mirroring.  This option turns on
           recursion and time-stamping, sets infinite recursion depth and
           keeps FTP directory listings.  It is currently equivalent to
           -r -N -l inf --no-remove-listing.

       -p
       --page-requisites
           This option causes Wget to download all the files that are
           necessary to properly display a given HTML page.  This
           includes such things as inlined images, sounds, and referenced
           stylesheets.

           Ordinarily, when downloading a single HTML page, any requisite
           documents that may be needed to display it properly are not
           downloaded.  Using -r together with -l can help, but since
           Wget does not ordinarily distinguish between external and
           inlined documents, one is generally left with "leaf documents"
           that are missing their requisites.

           For instance, say document 1.html contains an "<IMG>" tag
           referencing 1.gif and an "<A>" tag pointing to external
           document 2.html.  Say that 2.html is similar but that its
           image is 2.gif and it links to 3.html.  Say this continues up
           to some arbitrarily high number.

           If one executes the command:

                   wget -r -l 2 http://<site>/1.html

           then 1.html, 1.gif, 2.html, 2.gif, and 3.html will be
           downloaded.  As you can see, 3.html is without its requisite
           3.gif because Wget is simply counting the number of hops (up
           to 2) away from 1.html in order to determine where to stop the
           recursion.  However, with this command:

                   wget -r -l 2 -p http://<site>/1.html

           all the above files and 3.html's requisite 3.gif will be
           downloaded.  Similarly,

                   wget -r -l 1 -p http://<site>/1.html

           will cause 1.html, 1.gif, 2.html, and 2.gif to be downloaded.
           One might think that:

                   wget -r -l 0 -p http://<site>/1.html

           would download just 1.html and 1.gif, but unfortunately this
           is not the case, because -l 0 is equivalent to -l inf---that
           is, infinite recursion.  To download a single HTML page (or a
           handful of them, all specified on the command-line or in a -i
           URL input file) and its (or their) requisites, simply leave
           off -r and -l:

                   wget -p http://<site>/1.html

           Note that Wget will behave as if -r had been specified, but
           only that single page and its requisites will be downloaded.
           Links from that page to external documents will not be
           followed.  Actually, to download a single page and all its
           requisites (even if they exist on separate websites), and make
           sure the lot displays properly locally, this author likes to
           use a few options in addition to -p:

                   wget -E -H -k -K -p http://<site>/<document>

           To finish off this topic, it's worth knowing that Wget's idea
           of an external document link is any URL specified in an "<A>"
           tag, an "<AREA>" tag, or a "<LINK>" tag other than "<LINK
           REL="stylesheet">".

       --strict-comments
           Turn on strict parsing of HTML comments.  The default is to
           terminate comments at the first occurrence of -->.

           According to specifications, HTML comments are expressed as
           SGML declarations.  Declaration is special markup that begins
           with <! and ends with >, such as <!DOCTYPE ...>, that may
           contain comments between a pair of -- delimiters.  HTML
           comments are "empty declarations", SGML declarations without
           any non-comment text.  Therefore, <!--foo--> is a valid
           comment, and so is <!--one-- --two-->, but <!--1--2--> is not.

           On the other hand, most HTML writers don't perceive comments
           as anything other than text delimited with <!-- and -->, which
           is not quite the same.  For example, something like
           <!------------> works as a valid comment as long as the number
           of dashes is a multiple of four (!).  If not, the comment
           technically lasts until the next --, which may be at the other
           end of the document.  Because of this, many popular browsers
           completely ignore the specification and implement what users
           have come to expect: comments delimited with <!-- and -->.

           Until version 1.9, Wget interpreted comments strictly, which
           resulted in missing links in many web pages that displayed
           fine in browsers, but had the misfortune of containing
           non-compliant comments.  Beginning with version 1.9, Wget has
           joined the ranks of clients that implements "naive" comments,
           terminating each comment at the first occurrence of -->.

           If, for whatever reason, you want strict comment parsing, use
           this option to turn it on.

   Recursive Accept/Reject Options
       -A acclist --accept acclist
       -R rejlist --reject rejlist
           Specify comma-separated lists of file name suffixes or
           patterns to accept or reject. Note that if any of the wildcard
           characters, *, ?, [ or ], appear in an element of acclist or
           rejlist, it will be treated as a pattern, rather than a
           suffix.  In this case, you have to enclose the pattern into
           quotes to prevent your shell from expanding it, like in -A
           "*.mp3" or -A '*.mp3'.

       --accept-regex urlregex
       --reject-regex urlregex
           Specify a regular expression to accept or reject the complete
           URL.

       --regex-type regextype
           Specify the regular expression type.  Possible types are posix
           or pcre.  Note that to be able to use pcre type, wget has to
           be compiled with libpcre support.

       -D domain-list
       --domains=domain-list
           Set domains to be followed.  domain-list is a comma-separated
           list of domains.  Note that it does not turn on -H.

       --exclude-domains domain-list
           Specify the domains that are not to be followed.

       --follow-ftp
           Follow FTP links from HTML documents.  Without this option,
           Wget will ignore all the FTP links.

       --follow-tags=list
           Wget has an internal table of HTML tag / attribute pairs that
           it considers when looking for linked documents during a
           recursive retrieval.  If a user wants only a subset of those
           tags to be considered, however, he or she should be specify
           such tags in a comma-separated list with this option.

       --ignore-tags=list
           This is the opposite of the --follow-tags option.  To skip
           certain HTML tags when recursively looking for documents to
           download, specify them in a comma-separated list.

           In the past, this option was the best bet for downloading a
           single page and its requisites, using a command-line like:

                   wget --ignore-tags=a,area -H -k -K -r http://<site>/<document>

           However, the author of this option came across a page with
           tags like "<LINK REL="home" HREF="/">" and came to the
           realization that specifying tags to ignore was not enough.
           One can't just tell Wget to ignore "<LINK>", because then
           stylesheets will not be downloaded.  Now the best bet for
           downloading a single page and its requisites is the dedicated
           --page-requisites option.

       --ignore-case
           Ignore case when matching files and directories.  This
           influences the behavior of -R, -A, -I, and -X options, as well
           as globbing implemented when downloading from FTP sites.  For
           example, with this option, -A "*.txt" will match file1.txt,
           but also file2.TXT, file3.TxT, and so on.  The quotes in the
           example are to prevent the shell from expanding the pattern.

       -H
       --span-hosts
           Enable spanning across hosts when doing recursive retrieving.

       -L
       --relative
           Follow relative links only.  Useful for retrieving a specific
           home page without any distractions, not even those from the
           same hosts.

       -I list
       --include-directories=list
           Specify a comma-separated list of directories you wish to
           follow when downloading.  Elements of list may contain
           wildcards.

       -X list
       --exclude-directories=list
           Specify a comma-separated list of directories you wish to
           exclude from download.  Elements of list may contain
           wildcards.

       -np
       --no-parent
           Do not ever ascend to the parent directory when retrieving
           recursively.  This is a useful option, since it guarantees
           that only the files below a certain hierarchy will be
           downloaded.

ENVIRONMENT

       Wget supports proxies for both HTTP and FTP retrievals.  The
       standard way to specify proxy location, which Wget recognizes, is
       using the following environment variables:

       http_proxy
       https_proxy
           If set, the http_proxy and https_proxy variables should
           contain the URLs of the proxies for HTTP and HTTPS connections
           respectively.

       ftp_proxy
           This variable should contain the URL of the proxy for FTP
           connections.  It is quite common that http_proxy and ftp_proxy
           are set to the same URL.

       no_proxy
           This variable should contain a comma-separated list of domain
           extensions proxy should not be used for.  For instance, if the
           value of no_proxy is .mit.edu, proxy will not be used to
           retrieve documents from MIT.

EXIT STATUS

       Wget may return one of several error codes if it encounters
       problems.

       0   No problems occurred.

       1   Generic error code.

       2   Parse error---for instance, when parsing command-line options,
           the .wgetrc or .netrc...

       3   File I/O error.

       4   Network failure.

       5   SSL verification failure.

       6   Username/password authentication failure.

       7   Protocol errors.

       8   Server issued an error response.

       With the exceptions of 0 and 1, the lower-numbered exit codes take
       precedence over higher-numbered ones, when multiple types of
       errors are encountered.

       In versions of Wget prior to 1.12, Wget's exit status tended to be
       unhelpful and inconsistent. Recursive downloads would virtually
       always return 0 (success), regardless of any issues encountered,
       and non-recursive fetches only returned the status corresponding
       to the most recently-attempted download.

FILES

       /usr/local/etc/wgetrc
           Default location of the global startup file.

       .wgetrc
           User startup file.

BUGS

       You are welcome to submit bug reports via the GNU Wget bug tracker
       (see <https://savannah.gnu.org/bugs/?func=additem&group=wget >) or
       to our mailing list <bug-wget@gnu.org>.

       Visit <https://lists.gnu.org/mailman/listinfo/bug-wget > to get
       more info (how to subscribe, list archives, ...).

       Before actually submitting a bug report, please try to follow a
       few simple guidelines.

       1.  Please try to ascertain that the behavior you see really is a
           bug.  If Wget crashes, it's a bug.  If Wget does not behave as
           documented, it's a bug.  If things work strange, but you are
           not sure about the way they are supposed to work, it might
           well be a bug, but you might want to double-check the
           documentation and the mailing lists.

       2.  Try to repeat the bug in as simple circumstances as possible.
           E.g. if Wget crashes while downloading wget -rl0 -kKE -t5
           --no-proxy http://example.com -o /tmp/log, you should try to
           see if the crash is repeatable, and if will occur with a
           simpler set of options.  You might even try to start the
           download at the page where the crash occurred to see if that
           page somehow triggered the crash.

           Also, while I will probably be interested to know the contents
           of your .wgetrc file, just dumping it into the debug message
           is probably a bad idea.  Instead, you should first try to see
           if the bug repeats with .wgetrc moved out of the way.  Only if
           it turns out that .wgetrc settings affect the bug, mail me the
           relevant parts of the file.

       3.  Please start Wget with -d option and send us the resulting
           output (or relevant parts thereof).  If Wget was compiled
           without debug support, recompile it---it is much easier to
           trace bugs with debug support on.

           Note: please make sure to remove any potentially sensitive
           information from the debug log before sending it to the bug
           address.  The "-d" won't go out of its way to collect
           sensitive information, but the log will contain a fairly
           complete transcript of Wget's communication with the server,
           which may include passwords and pieces of downloaded data.
           Since the bug address is publicly archived, you may assume
           that all bug reports are visible to the public.

       4.  If Wget has crashed, try to run it in a debugger, e.g. "gdb
           `which wget` core" and type "where" to get the backtrace.
           This may not work if the system administrator has disabled
           core files, but it is safe to try.

SEE ALSO

       This is not the complete manual for GNU Wget.  For more complete
       information, including more detailed explanations of some of the
       options, and a number of commands available for use with .wgetrc
       files and the -e option, see the GNU Info entry for wget.

       Also see wget2(1), the updated version of GNU Wget with even
       better support for recursive downloading and modern protocols like
       HTTP/2.

AUTHOR

       Originally written by Hrvoje Nikšić <hniksic@xemacs.org>.
       Currently maintained by Darshit Shah <darnir@gnu.org> and Tim
       Rühsen <tim.ruehsen@gmx.de>.

COPYRIGHT

       Copyright (c) 1996--2011, 2015, 2018--2024 Free Software
       Foundation, Inc.

       Permission is granted to copy, distribute and/or modify this
       document under the terms of the GNU Free Documentation License,
       Version 1.3 or any later version published by the Free Software
       Foundation; with no Invariant Sections, with no Front-Cover Texts,
       and with no Back-Cover Texts.  A copy of the license is included
       in the section entitled "GNU Free Documentation License".

COLOPHON

       This page is part of the wget (interactive network downloader)
       project.  Information about the project can be found at 
       ⟨http://www.gnu.org/software/wget/⟩.  If you have a bug report for
       this manual page, send it to bug-sed@gnu.org.  This page was
       obtained from the tarball wget-1.25.0.tar.gz fetched from
       ⟨https://www.gnu.org/software/wget/⟩ on 2024-02-02.  If you
       discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for the
       page, or you have corrections or improvements to the information
       in this COLOPHON (which is not part of the original manual page),
       send a mail to man-pages@man7.org