In fact you probably shouldn't use exit 0 for an error at all. Better to use die $message instead.

Giving a non-zero exit code (as die() does) on error makes combining scripts in shell scripts / one-liners a lot easier: 

my-shell$ check-this-config-file.pl && then-stop-this-server && then-d
+o-a-lot-of-stuff.pl && then-start-that-server

[download]
And yes I do this a lot.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re^2: somewhat OT: Subroutines within if statements by Joost
in thread Subroutines within if statements by muizelaar

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