See http://perldoc.com/perl5.8.4/pod/perlrun.html#Command-Switches. The description for the -0 switch.
Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"Think for yourself!" - Abigail
"Memory, processor, disk in that order on the hardware side. Algorithm, algorithm, algorithm on the code side." - tachyon