apachegrep is a perl program to help webmasters go through their apache logs
and try to pullout various bits of information.
Built in the spirit of unix tools, it's designed to be used standalone or
as part of a pipeline of tools to pore over common (or combined) logs and
print out entire lines, specified fields or a simple count of matching lines.
You specify what fields you want and what regular expression you want applied
to that field.

It supports gzipped and bzipped log files.