NAME

       dwww-cache - manage the dwww cache of converted documents

SYNOPSIS

       dwww-cache --lookup type location
       dwww-cache --store type location
       dwww-cache --list type location
       dwww-cache --list-all
       dwww-cache --clean

DESCRIPTION

       dwww-cache  manages  the  cache  of  converted  documents;  it  is part of dwww(7).  An option (the first
       argument) specifies the operation.  Some operations operate  on  the  whole  cache,  and  need  no  other
       arguments.   Others  need  the second and third argument to specify the type and pathname of the original
       document.  (See dwww-convert(8) for more information about the arguments.)

       The operations are:

       --lookup
              If the document is in the cache, output it to the standard output.  Otherwise, output nothing  and
              return a non-zero status.

       --store
              Read  the document from the standard input, output it to the standard output and store it into the
              cache.  If there was an older version already in the cache, remove it.

       --list Output information about one document in the cache to the standard output.  The information is one
              line, with five space delimited fields: type, pathname of original file, pathname of cached  file,
              size (actually the last two bytes of size) of the cached file, and cache  entry validity indicator
              (which can be either "valid" or "outdated").

       --list-all
              Like --list, but for all documents.

       --clean
              Forget all cached documents that are already outdated.

       dwww-cache  maintains  a database with information of the cached documents.  The documents themselves are
       stored in separate files in the cache directory.  When old documents are removed  from  the  cache  by  a
       suitable crontab entry, they will still exist in the database.  The --clean operation removes all entries
       from  the database where either the original or the converted file is missing or where the converted file
       is outdated.

       To stop the cache from growing too large, there should be an entry for  dwww-refresh-cache(8)  in  system
       crontab  to  remove  cached  files  that  have  not been accessed for a while.  The dwww-refresh-cache(8)
       program internally uses commands similar to
              find /var/cache/dwww -atime +$DWWW_KEEPDAYS | xargs rm -f
              dwww-cache --clean
       to remove all documents that have not been accessed for a number of days specified in the  $DWWW_KEEPDAYS
       configuration variable.

       The  idea is to first delete the old cached files and then clean up the database.  The policy of cleaning
       the cache has been kept outside  of  dwww-cache  to  keep  the  program  simple,  and  to  allow  maximum
       flexibility.   The  default  dwww installation creates a /etc/cron.daily/dwww, which automatically cleans
       the cache each day.

FILES

       /var/cache/dwww/db
              The cache directory.

       /var/cache/dwww/db/.cache_db
              The database with information about all cached  documents.   This  is  a  binary  file,  specially
              encoded for small size and high speed, and should not be touched by anyone but dwww-cache.

SEE ALSO

       dwww(7), dwww-convert(8).  dwww-refresh-cache(8).

AUTHOR

       Lars Wirzenius <liw@iki.fi>.  Modified by Robert Luberda <robert@debian.org>.
       See dwww(7) for copyrights and stuff.

dwww 1.13.0                                    February 7th, 2016                                  DWWW-CACHE(8)