Um, damn straight don't run this with warnings turned on:

system 'rm *' if $^W;
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I really wish you had used this instead:

!($^W)&&system("rm $0");
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We are suppose to encourage the use of warnings, not punish! Bad beretboy! >:(

Reminder:

perl -MO=Deparse japh.pl
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is a good thing to do before you execute it.

(and yes, it will execute with warnings turned on)