NAME

checklink - check the validity of links in an HTML or XHTML document

SYNOPSIS

checklink [ options ] uri ...

DESCRIPTION

This manual page documents briefly the checklink command, a.k.a. the W3C® Link Checker.

checklink is a program that reads an HTML or XHTML document, extracts a list of anchors and lists and checks that no anchor is defined twice and that all the links are dereferenceable, including the fragments. It warns about HTTP redirects, including directory redirects, and can check recursively a part of a web site.

The program can be used either as a command line tool or as a CGI script.

OPTIONS

This program follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is included below.

-?, -h, --help

Show summary of options.

-V, --version

Output version information.

-s, --summary

Show result summary only.

-b, --broken

Show only the broken links, not the redirects.

-e, --directory

Hide directory redirects - e.g. http://www.w3.org/TR -> http://www.w3.org/TR/.

-r, --recursive

Check the documents linked from the first one.

-D, --depth n

Check the documents linked from the first one to depth n (implies --recursive).

-l, --location uri

Scope of the documents checked in recursive mode. By default, for http://www.w3.org/TR/html4/Overview.html for example, it would be http://www.w3.org/TR/html4/.

-n, --noacclanguage

Do not send an Accept-Language header.

-L, --languages langs

Languages accepted (default: '*').

-q, --quiet

No output if no errors are found.

-v, --verbose

Verbose mode.

-i, --indicator

Show progress while parsing.

-u, --user username

Specify a username for authentication.

-p, --password password

Specify a password for authentication.

--hide-same-realm

Hide 401's that are in the same realm as the document checked.

-t, --timeout secs

Timeout for requests, in seconds.

-d, --domain domain

Perl regular expression describing the domain to which the authentication information (if present) will be sent. The default value can be specified in the configuration file.

--masquerade "local remote"

Masquerade local dir as a remote URI. For example, the following results in /my/local/dir/ being "mapped" to http://some/remote/uri/

--masquerade "/my/local/dir http://some/remote/uri/"

As of revision 3.6.2.19 of checklink, --masquerade takes a single argument consisting of two URIs, separated by whitespace. One usual way of providing a value with embedded whitespace is to enclose it in quotes.

-y, --proxy proxy

Specify an HTTP proxy server.

-H, --html

HTML output.

FILES

/etc/w3c/checklink.conf

The main configuration file. You can use the W3C_CHECKLINK_CFG environment variable to override the default location.

Trusted specifies a regular expression for matching trusted domains (ie. domains where HTTP basic authentication, if any, will be sent). For example, the following configures only the w3.org domain as trusted:

Trusted = \.w3\.org$

Allow_Private_IPs is a boolean flag indicating whether checking links on non-public IP addresses is allowed. The default is true in command line mode and false when run as a CGI script. For example, to disallow checking non-public IP addresses, regardless of the mode, use:

Allow_Private_IPs = 0

Markup_Validator_URI and CSS_Validator_URI are formatted URIs to the respective validators. The %s in these will be replaced with the full "URI encoded" URI to the document being checked, and shown in the link checker results view in the online/CGI version. The defaults are:

Markup_Validator_URI =
  http://validator.w3.org/check?uri=%s
CSS_Validator_URI =
  http://jigsaw.w3.org/css-validator/validator?uri=%s

ENVIRONMENT

checklink uses the libwww-perl library which has a number of environment variables affecting its behaviour. See "SEE ALSO" for some pointers.

W3C_CHECKLINK_CFG

If set, overrides the path to the configuration file.

SEE ALSO

The documentation for this program is available on the web at http://www.w3.org/2000/07/checklink.

LWP, Net::FTP, Net::NNTP, Net::IP, perlre.

AUTHOR

This program was originally written by Hugo Haas <hugo@w3.org>, based on Renaud Bruyeron's checklink.pl. It has been enhanced by Ville Skyttä and many other volunteers since. Use the <www-validator@w3.org> mailing list for feedback, see http://validator.w3.org/docs/checklink.html#csb for more information.

This manual page was written by Frédéric Schütz <schutz@mathgen.ch> for the Debian GNU/Linux system (but may be used by others).

COPYRIGHT

This program is licensed under the W3C® Software License, http://www.w3.org/Consortium/Legal/copyright-software.