Perl makes this sort of thing very easy to do. If you want to delete all files that are older than 31 days, you need to read up on the stat function -- specifically, subtract the "ctime" of the file from the current timestamp and see if it's greater than (24 * 60 * 60 * 31). Also, read up on unlink, and possibly File::Find.
HTH.
perl -e 'print "How sweet does a rose smell? "; chomp ($n = <STDIN>);
+$rose = "smells sweet to degree $n"; *other_name = *rose; print "$oth
+er_name\n"'
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