Usage:

   p4pcm.pl [-d "proxy_cache_dir"] [-tlow <low_threshold>] [-thigh <high_threshold>] [-n/-s]
or
   p4pcm.pl -h

This utility removes files in the proxy cache if the amount of free disk
space available to the cache falls below the low threshold (default 12).
It removes cache files based on time last accessed starting with the least
recently accessed continuing until either all files are deleted or the free disk
space available to the cache specified by the high threshold (default 25)
is reached. Specify numeric threshold values in kilobyte units (kb), or as a number
less than 100 to specify percentage of the total disk space available to
the cache. A high_threshold near the available disk space typically results in a
full clear of the cache defeating the purpose of a proxy.

The '-d "proxy_cache_dir"' argument is required unless $P4PCACHE is defined.
The -d argument takes precedence. proxy_cache_dir should be a fully rooted path
starting with '/'. Relative or local paths are fatal to tool operation.

The log is $LOGS/p4pcm.log if $LOGS is defined, else p4pcm.log in the current
directory.

The removal nomination file list is $LOGS/p4pcm.nomlist if $LOGS is
defined, else p4pcm.nomlist in the current directory. The nomination list
file contains an access time ordered list of all cache files. If the nomination
list file exists at the start of this tool, the tool exits assuming a separate
run is currently in progress. The nomination list file is deleted when the tool
completes operation unless the '-s' argument is specified.

Use '-n' or '-s' to show what files would be removed. '-s' also causes the
nomination list file to remain undeleted. The nomination list file must be
manually removed prior to a subsequent successful use of this tool.