| dwww-cache(8) - phpMan
DWWW-CACHE(8) Debian DWWW-CACHE(8)
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, out‐
put 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 origi‐
nal, 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 con‐
verted 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 pol‐
icy 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 any‐
one but dwww-cache.
SEE ALSO
dwww(7), dwww-convert(8).
AUTHOR
Lars Wirzenius <liw AT iki.fi>. Modified by Robert Luberda <robert AT debian.org>.
See dwww(7) for copyrights and stuff.
dwww 1.11.1 February 15th, 2009 DWWW-CACHE(8)
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