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/etc/default/apache2 is in apache2 2.4.7-1ubuntu4.

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### htcacheclean settings ###

## run htcacheclean: yes, no, auto
## auto means run if /etc/apache2/mods-enabled/cache_disk.load exists
## default: auto
HTCACHECLEAN_RUN=auto

## run mode: cron, daemon
## run in daemon mode or as daily cron job
## default: daemon
HTCACHECLEAN_MODE=daemon

## cache size 
HTCACHECLEAN_SIZE=300M

## interval: if in daemon mode, clean cache every x minutes
HTCACHECLEAN_DAEMON_INTERVAL=120

## path to cache
## must be the same as in CacheRoot directive
HTCACHECLEAN_PATH=/var/cache/apache2/mod_cache_disk

## additional options:
## -n : be nice
## -t : remove empty directories
HTCACHECLEAN_OPTIONS="-n"