Nifty perl trick I learned about today

[pauamma]

Context was someone asking why

print "Hello, world!\n" && die;

doesn't output anything. Someone replied with a nifty trick to help figure this out:

perl -MO=Deparse -e 'print "Hello, world!\n" && die;'

(go ahead and try it in your Dreamhack).

Comments

[afuna]

Oh neat.

(What is the O for? I can find -M in man perlrun, but I can't find -O)

[alierak]

It's the argument to -M. "perldoc O" should do something.

[afuna]

Oh dur. So obvious now, thanks!