trusty (8) dwww-cache.8.gz

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  four  space  delimited  fields:  type,  pathname of original, pathname of cached, and
              permanent flag (y or n).

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

       --clean
              Forget all cached documents that have been deleted.

       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.  This operation removes all  entries  from
       the database where either the original or the converted file is now missing.

       To stop the cache from growing too large, an entry in root's crontab should remove cached files that have
       not been accessed for a while.  For example, the following commands remove all documents  that  have  not
       been accessed for ten days:

              find /var/cache/dwww -atime +10 | xargs rm -f
              dwww-cache --clean

       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).

AUTHOR

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