Provided by: linkchecker_7.4-1_i386 bug


       linkchecker - check HTML documents and websites for broken links


       linkchecker [options] [file-or-url]...


       LinkChecker  features  recursive  checking,  multithreading,  output in
       colored or normal text, HTML, SQL, CSV or a sitemap  graph  in  GML  or
       XML,  support  for  HTTP/1.1, HTTPS, FTP, mailto:, news:, nntp:, Telnet
       and local  file  links,  restriction  of  link  checking  with  regular
       expression   filters   for   URLs,   proxy  support,  username/password
       authorization for HTTP and FTP, robots.txt exclusion protocol  support,
       i18n  support,  a  command line interface and a (Fast)CGI web interface
       (requires HTTP server)


       The most common use checks the given domain recursively, plus  any  URL
       pointing outside of the domain:
       Beware  that  this  checks  the  whole site which can have thousands of
       URLs.  Use the -r option to restrict the recursion depth.
       Don't connect to mailto: hosts, only check their URL syntax. All  other
       links are checked as usual:
         linkchecker --ignore-url=^mailto:
       Checking a local HTML file on Unix:
         linkchecker ../bla.html
       Checking a local HTML file on Windows:
         linkchecker c:\temp\test.html
       You can skip the http:// url part if the domain starts with www.:
       You can skip the ftp:// url part if the domain starts with ftp.:
         linkchecker -r0
       Generate a sitemap graph and convert it with the graphviz dot utility:
         linkchecker -odot -v | dot -Tps >


   General options
       -h, --help
              Help me! Print usage information for this program.

       -fFILENAME, --config=FILENAME
              Use  FILENAME as configuration file. As default LinkChecker uses

       -tNUMBER, --threads=NUMBER
              Generate no more than  the  given  number  of  threads.  Default
              number  of  threads  is  10. To disable threading specify a non-
              positive number.

       -V, --version
              Print version and exit.

              Read list of white-space separated URLs to check from stdin.

   Output options
       -v, --verbose
              Log all checked URLs once. Default is to  log  only  errors  and

              Log  all URLs, including duplicates. Default is to log duplicate
              URLs only once.

              Don't log warnings. Default is to log warnings.

       -WREGEX, --warning-regex=REGEX
              Define a regular expression which prints a warning if it matches
              any  content  of  the  checked link.  This applies only to valid
              pages, so we can get their content.
              Use this to check for pages that contain some form of error, for
              example "This page has moved" or "Oracle Application error".
              Note  that  multiple  values  can  be  combined  in  the regular
              expression, for example "(This page has moved|Oracle Application
              See section REGULAR EXPRESSIONS for more info.

              Print  a  warning  if content size info is available and exceeds
              the given number of bytes.

              Check syntax of HTML URLs with local library (HTML tidy).

              Check syntax of HTML URLs with W3C online validator.

              Check syntax of CSS URLs with local library (cssutils).

              Check syntax of CSS URLs with W3C online validator.

              Scan content of URLs for viruses with ClamAV.

       -q, --quiet
              Quiet operation, an alias for -o none.  This is only useful with

       -oTYPE[/ENCODING], --output=TYPE[/ENCODING]
              Specify output type as text, html, sql, csv, gml, dot, xml, none
              or blacklist.  Default type is text. The  various  output  types
              are documented below.
              The  ENCODING specifies the output encoding, the default is that
              of   your   locale.    Valid    encodings    are    listed    at

              Output        to        a       file       linkchecker-out.TYPE,
              $HOME/.linkchecker/blacklist for blacklist output,  or  FILENAME
              if  specified.   The ENCODING specifies the output encoding, the
              default is that of your locale.  Valid encodings are  listed  at
              The  FILENAME and ENCODING parts of the none output type will be
              ignored,  else  if  the  file  already  exists,   it   will   be
              overwritten.   You can specify this option more than once. Valid
              file output types are text, html, sql, csv, gml, dot, xml,  none
              or blacklist Default is no file output. The various output types
              are documented below. Note that you  can  suppress  all  console
              output with the option -o none.

              Do not print check status messages.

       -DSTRING, --debug=STRING
              Print  debugging output for the given logger.  Available loggers
              are cmdline, checking, cache, gui, dns and all.  Specifying  all
              is  an  alias  for specifying all available loggers.  The option
              can be given multiple times to debug with more than one  logger.
                For  accurate results, threading will be disabled during debug

              Print tracing information.

              Write profiling data into a file named  in  the
              current working directory. See also --viewprof.

              Print   out   previously  generated  profiling  data.  See  also

   Checking options
       -rNUMBER, --recursion-level=NUMBER
              Check recursively all links up to given depth.  A negative depth
              will enable infinite recursion.  Default depth is infinite.

              Check  but  do  not recurse into URLs matching the given regular
              This option can be given multiple times.
              See section REGULAR EXPRESSIONS for more info.

              Only check syntax of URLs matching the given regular expression.
              This option can be given multiple times.
              See section REGULAR EXPRESSIONS for more info.

       -C, --cookies
              Accept and send HTTP cookies according to RFC 2109. Only cookies
              which  are  sent  back  to  the originating server are accepted.
              Sent and accepted cookies are  provided  as  additional  logging

              Read  a file with initial cookie data. The cookie data format is
              explained below.

       -a, --anchors
              Check HTTP anchor references. Default is not to  check  anchors.
              This option enables logging of the warning url-anchor-not-found.

       -uSTRING, --user=STRING
              Try  the given username for HTTP and FTP authorization.  For FTP
              the default username is anonymous. For HTTP there is no  default
              username. See also -p.

       -p, --password
              Read  a  password  from  console  and  use  it  for HTTP and FTP
              authorization.  For FTP the default password is anonymous@.  For
              HTTP there is no default password. See also -u.

              Set  the timeout for connection attempts in seconds. The default
              timeout is 60 seconds.

       -PNUMBER, --pause=NUMBER
              Pause  the  given  number  of  seconds  between  two  subsequent
              connection  requests  to  the  same  host.  Default  is no pause
              between requests.

       -NSTRING, --nntp-server=STRING
              Specify  an  NNTP  server  for  news:  links.  Default  is   the
              environment  variable NNTP_SERVER. If no host is given, only the
              syntax of the link is checked.

              Specify the User-Agent string to send to the  HTTP  server,  for
              example  "Mozilla/4.0".  The  default is "LinkChecker/X.Y" where
              X.Y is the current version of LinkChecker.


       Configuration files can  specify  all  options  above.  They  can  also
       specify  some  options  that  cannot  be  set on the command line.  See
       linkcheckerrc(5) for more info.


       Note that by default only errors and warnings are logged.   You  should
       use  the --verbose option to get the complete URL list, especially when
       outputting a sitemap graph format.

       text   Standard text logger, logging URLs in keyword: argument fashion.

       html   Log URLs  in  keyword:  argument  fashion,  formatted  as  HTML.
              Additionally  has  links  to  the referenced pages. Invalid URLs
              have HTML and CSS syntax check links appended.

       csv    Log check result in CSV format with one URL per line.

       gml    Log parent-child relations between linked URLs as a GML  sitemap

       dot    Log  parent-child relations between linked URLs as a DOT sitemap

       gxml   Log check result as a GraphXML sitemap graph.

       xml    Log check result as machine-readable XML.

       sql    Log check result as SQL script with INSERT commands. An  example
              script   to   create  the  initial  SQL  table  is  included  as

              Suitable for cron jobs.  Logs  the  check  result  into  a  file
              ~/.linkchecker/blacklist   which   only  contains  entries  with
              invalid URLs and the number of times they have failed.

       none   Logs nothing. Suitable for debugging or checking the exit code.


       LinkChecker    accepts     Python     regular     expressions.      See for an introduction.

       An  addition  is  that  a  leading exclamation mark negates the regular


       A cookie file contains standard HTTP header (RFC 2616)  data  with  the
       following possible names:

       Scheme (optional)
              Sets  the  scheme  the  cookies are valid for; default scheme is

       Host (required)
              Sets the domain the cookies are valid for.

       Path (optional)
              Gives the path the cookies are value for; default path is /.

       Set-cookie (optional)
              Set cookie name/value. Can be given more than once.

       Multiple entries are separated by a blank line.  The example below will
       send  two  cookies  to all URLs starting with
       and one to all URLs starting with

        Path: /hello
        Set-cookie: ID="smee"
        Set-cookie: spam="egg"

        Scheme: https
        Set-cookie: baggage="elitist"; comment="hologram"


       To use a proxy on Unix or Windows set the $http_proxy, $https_proxy  or
       $ftp_proxy environment variables to the proxy URL. The URL should be of
       the  form  http://[user:pass@]host[:port].   LinkChecker  also  detects
       manual  proxy settings of Internet Explorer under Windows systems. On a
       Mac use the Internet Config to select a proxy.   You  can  also  set  a
       comma-separated  domain  list in the $no_proxy environment variables to
       ignore any proxy settings for these domains.  Setting a HTTP  proxy  on
       Unix for example looks like this:

         export http_proxy=""

       Proxy authentication is also supported:

         export http_proxy=""

       Setting a proxy on the Windows command prompt:

         set http_proxy=


       All URLs have to pass a preliminary syntax test. Minor quoting mistakes
       will issue a warning, all  other  invalid  syntax  issues  are  errors.
       After  the  syntax  check  passes,  the  URL  is  queued for connection
       checking. All connection check types are described below.

       HTTP links (http:, https:)
              After connecting to the given HTTP  server  the  given  path  or
              query  is  requested.  All  redirections  are  followed,  and if
              user/password is given it will be  used  as  authorization  when
              necessary.   Permanently moved pages issue a warning.  All final
              HTTP status codes other than 2xx are errors.  HTML page contents
              are checked for recursion.

       Local files (file:)
              A regular, readable file that can be opened is valid. A readable
              directory is also valid. All other  files,  for  example  device
              files,  unreadable  or  non-existing  files are errors.  HTML or
              other parseable file contents are checked for recursion.

       Mail links (mailto:)
              A mailto: link eventually resolves to a list of email addresses.
              If  one  address fails, the whole list will fail.  For each mail
              address we check the following things:
                1) Check the adress syntax, both of the part before and after
                   the @ sign.
                2) Look up the MX DNS records. If we found no MX record,
                   print an error.
                3) Check if one of the mail hosts accept an SMTP connection.
                   Check hosts with higher priority first.
                   If no host accepts SMTP, we print a warning.
                4) Try to verify the address with the VRFY command. If we got
                   an answer, print the verified address as an info.

       FTP links (ftp:)

                For FTP links we do:

                1) connect to the specified host
                2) try to login with the given user and password. The default
                   user   is   ``anonymous``,   the   default   password    is
                3) try to change to the given directory
                4) list the file with the NLST command

              - Telnet links (``telnet:``)

                We try to connect and if user/password are given, login to the
                given telnet server.

              - NNTP links (``news:``, ``snews:``, ``nntp``)

                We try to connect to the given NNTP server. If a news group or
                article is specified, try to request it from the server.

              - Ignored links (``javascript:``, etc.)

                An ignored link will only print a warning. No further checking
                will be made.

                Here  is a complete list of recognized, but ignored links. The
                prominent of them should be JavaScript links.

                - ``acap:``      (application configuration access protocol)
                - ``afs:``       (Andrew File System global file names)
                - ``chrome:``    (Mozilla specific)
                - ``cid:``       (content identifier)
                - ``clsid:``     (Microsoft specific)
                - ``data:``      (data)
                - ``dav:``       (dav)
                - ``fax:``       (fax)
                - ``find:``      (Mozilla specific)
                - ``gopher:``    (Gopher)
                - ``imap:``      (internet message access protocol)
                - ``isbn:``      (ISBN (int. book numbers))
                - ``javascript:`` (JavaScript)
                - ``ldap:``      (Lightweight Directory Access Protocol)
                - ``mailserver:`` (Access to data available from mail servers)
                - ``mid:``       (message identifier)
                - ``mms:``       (multimedia stream)
                - ``modem:``     (modem)
                - ``nfs:``       (network file system protocol)
                - ``opaquelocktoken:`` (opaquelocktoken)
                - ``pop:``       (Post Office Protocol v3)
                - ``prospero:``  (Prospero Directory Service)
                - ``rsync:``     (rsync protocol)
                - ``rtsp:``      (real time streaming protocol)
                - ``service:``   (service location)
                - ``shttp:``     (secure HTTP)
                - ``sip:``       (session initiation protocol)
                - ``tel:``       (telephone)
                - ``tip:``       (Transaction Internet Protocol)
                - ``tn3270:``    (Interactive 3270 emulation sessions)
                - ``vemmi:``     (versatile multimedia interface)
                - ``wais:``      (Wide Area Information Servers)
                - ``z39.50r:``   (Z39.50 Retrieval)
                - ``z39.50s:``   (Z39.50 Session)


       Before descending recursively into a URL, it  has  to  fulfill  several
       conditions. They are checked in this order:

       1. A URL must be valid.

       2. A URL must be parseable. This currently includes HTML files,
          Opera bookmarks files, and directories. If a file type cannot
          be determined (for example it does not have a common HTML file
          extension, and the content does not look like HTML), it is assumed
          to be non-parseable.

       3. The URL content must be retrievable. This is usually the case
          except for example mailto: or unknown URL types.

       4. The maximum recursion level must not be exceeded. It is configured
          with the ``--recursion-level`` option and is unlimited per default.

       5. It must not match the ignored URL list. This is controlled with
          the ``--ignore-url`` option.

       6. The Robots Exclusion Protocol must allow links in the URL to be
          followed recursively. This is checked by searching for a
          "nofollow" directive in the HTML header data.

       Note  that  the  directory recursion reads all files in that directory,
       not just a subset like ``index.htm*``.


       URLs on the commandline starting with ftp. are treated like ftp://ftp.,
       URLs  starting  with  www.  are treated like http://www..  You can also
       give local files as arguments.

       If you  have  your  system  configured  to  automatically  establish  a
       connection  to  the  internet  (e.g.  with diald), it will connect when
       checking links not pointing to your local host.  Use  the  --ignore-url
       option to prevent this.

       Javascript links are currently ignored.

       If  your  platform  does not support threading, LinkChecker disables it

       You can supply multiple user/password pairs in a configuration file.

       When checking news: links the given NNTP host doesn't need  to  be  the
       same as the host of the user browsing your pages.


       NNTP_SERVER - specifies default NNTP server
       http_proxy - specifies default HTTP proxy server
       ftp_proxy - specifies default FTP proxy server
       no_proxy  - comma-separated list of domains to not contact over a proxy
       LC_MESSAGES, LANG, LANGUAGE - specify output language


       The return value is 2 when

       ·      a program error occurred.

       The return value is 1 when

       ·      invalid links were found or

       ·      link warnings were found and warnings are enabled

       Else the return value is zero.


       LinkChecker  consumes  memory  for  each  queued  URL  to  check.  With
       thousands of queued URLs the amount of consumed memory can become quite
       large. This might slow down the program or even the whole system.


       ~/.linkchecker/linkcheckerrc - default configuration file
       ~/.linkchecker/blacklist - default blacklist logger output filename
       linkchecker-out.TYPE - default logger file output name  -  valid
       output encodings     -     regular    expression




       Bastian Kleineidam <>


       Copyright © 2000-2012 Bastian Kleineidam