untested Perl one liner:
perl -e 'system "rm -rf $_" if ( -M $_ > 14 ) for ( glob "/var/backups
Note: this is a deliberately simplistic example. To optimise it to avoid shelling out (using either File::Find
or putting the glob in a recursive subroutine) would require more Perl experience than OP suggests.
Update: Newbies will particularly benefit from Learning Perl, Third Edition -
Making Easy Things Easy and Hard Things Possible
By Randal L. Schwartz & Tom Phoenix.
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