Also, in 5.8.8 and 5.10 there is a difference between -w and -W (note lower / upper case). The link to perlrun, above is older and doesn't mention the distinction. -W (uppercase) allows no override with no warnings; and so might be used in development with -w in prod if you want the chore of fine tuning your prod warnings with no warnings; as opposed to taking them out altogether like DrHyde.

#my sig used to say 'I humbly seek wisdom. '. Now it says:
use strict;
use warnings;
I humbly seek wisdom.

In reply to Re^2: shebang arguments by goibhniu
in thread shebang arguments by pc0019

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