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              "valid" or "outdated").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              Forget all cached documents that are already outdated.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       the converted file is missing or where the converted file is outdated.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.