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mkdir RCS
ci -u file.pl # check in file (inital touched version)
...
rlog file.pl # history of a file
rcsdiff -r1.2 file.pl # diff versions of files
co -r1.2 file.pl # get an earlier version of a file

my $v = q{$Id$};
print "$v\n";

or simply
# $Id$

rlog file.pl # display a log history of the file changes from version 
+to version...