"Doing a linear scan over an associative array is like trying to club someone to death with a loaded Uzi." [Larry Wall]
When I was responsible for the administration of half a dozen Unix machines with about 150 users, I solved some systems administration tasks with Perl.
Some years later I developed a Perl program to compare correlation matrices stored in Algo format.
Two funny Perl implementations:
Solutions to the eight queens puzzle
Game of Nim