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ck4up(1)							      ck4up(1)

       ck4up - Check for Updates, a utility to monitor web pages for updates

       ck4up [options] [<regexp> ...]

       ck4up  is  a  small  command-line  utility,  written in ruby, primarily
       intended for CRUX ports maintainers to watch http  and  ftp  sites  for
       updates, but may also be useful for others.

       ck4up  scans through a configuration file, fetches the listed URLs from
       the web, computes the md5sum of the page, and compares the  value  with
       one stored in a gdbm database. If both differ a message will be written
       to the standard output.

       To improve performance, ck4up is multi-threaded. A configurable	number
       of  threads fetches pages in parallel. The default setting is a maximum
       of 20 threads and can be changed at the top  of	the  script  (variable

       Regular expressions can be applied to each page in the event that ck4up
       produces repetitive diff messages. For example, if daily snapshots  and
       a web counter are on the same page.

       To  simplify  maintenance  of  the configuration file, a kind of macro-
       expansion can be used.

       -d, --debug
	      Run ck4up in debug mode. All fetched pages will  be  written  to
	      the  standard  output.  This  is especially useful when combined
	      with a regexp to limit the number of pages to process.

       -k, --keep
	      Keep md5 values, don't update the database.

       -v, --verbose
	      Verbose mode. Print a message also for unchanged pages.

       -h, --help
	      Print a short help message and exit.

       -p, --parseonly
	      Parse configuration file, expand macros and print lines  matched
	      by <regexp>.  Do not fetch any remote data.

       -c, --cleandb
	      Removes unused entries from the ck4up database.

       -f <file>, --config <file>
	      Use alternative configuration from <file> instead of the default
	       ~/.ck4up/ck4up.conf.   ck4up  creates  a database with the same
	      full pathname but the extension replaced by .dbm.

	      Process only configuration-lines matching <regexp>. If more than
	      one  expression is given, all of them are or'ed to build a regu‐
	      lar expression.

       The configuration file for ck4up contains lines with macro  definitions
       and  lines  defining  URLs to check for updates.	 Blank lines and lines
       beginning  with	a  pound-sign,	which  are  considered	comments,  are
       ignored. Spaces at the beginning of definition-lines are not allowed.
       The   default   location	  for	the   ck4up   configuration   file  is

       <name> <type> <url> [<regexp>]

       Lines starting with a valid character in the  range  [a-zA-Z]  are  URL
       lines,  defining	 the  web-pages	 you  would like to check for updates.
       <name> is a symbolic name for the URL, md5 is the only valid entry  for
       <type>  at the moment, <url> is the URL of the web-site, <regexp> is an
       optionally extended regular expression.	Don't use spaces  in  regexps,
       but \s instead.


       apache  md5	httpd-2[0-9.]*
       uw-imap md5

       <@[A-Za-z0-9_]*@> <string> [<string>]

       Lines  starting	with  @	 define	 macros for later use.	A system macro
       @NAME@, which is the <name> of the URL line, can be used in other macro
       definitions.   This  is	handy if many URLs follow a common syntax. See
       the examples for @SF@ and  @GNOME@  below.   Macro  expansion  is  done
       recursively,  allowing macros to be nested.  See the @FM@ example below
       which makes use of freshmeat's XML project database.

       Example of a configuration file containing URL and macro definitions:

       @SFpkg@	 &package_id=

       @TAR@	 @NAME@-.*?\.tar\.[bg]z2?

       @FM_reg@	 <latest_release_version>.*</latest_release_version>
       @FM@	 @FM_url@ @FM_reg@
       @GNU@	 @TAR@

       apache	    md5   httpd-2[0-9.]*
       crux	    md5	 @FM@
       exim	    md5	 @SUN@/exim/exim/exim4/		    @TAR@
       gawk	    md5	 @GNU@
       maildrop	    md5	 @SFgrp@5404@SFpkg@7979		    @TAR@
       gnome-panel  md5	 @GNOME@
       uw-imap	    md5 imap-200.?[a-z]*

       If a environment variable HTTP_PROXY or http_proxy is set with a	 valid
       URI, e.g. http://server.localnet:3128/, ck4up make use of the proxy for
       the HTTP and HTTPS protocols.

       ~/.ck4up/ck4up.conf - configuration-file
       ~/.ck4up/ck4up.dbm - gdbm database to store the md5 hashes

       Juergen Daubert <>

ck4up 1.3			  Apr 08 2014			      ck4up(1)

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