Adding CVS version information to a Perl script
At the top of your script add a line like:
my $cvs_version = '$Revision: $';
After you commit this change to CVS, future updates will contain an expanded version of the line:
my $cvs_version = '$Revision: 1.17 $';
You can then use $cvs_version however you like in the rest of your script and it will always be kept current.