snippet grinder <p>lsof is a tool to LiSt Open Files. It's a handy tool to have when you need to find out why you can't dismount a device, or see if a process is about to exceed its maximum number of allowed file handles. (Here's the [http://freshmeat.net/projects/lsof/|project homepage]).</p> <p>But the output is verbose. If you just want the number of open files, and the process name and pid, the following one-liner performs a nice summary.</p> <CODE> lsof | perl -lane '$x{"$F[0]:$F[1]"}++; END { print "$x{$_}\t$_" for sort {$x{$a}<=>$x{$b}} keys %x}' </CODE>