http://www.perlmonks.org?node_id=442041


in reply to "-e" and "-d" switches

-d checks to see if something is a directory. -e checks to see if something exists. q.v. Filetest operators for more info.

Being right, does not endow the right to be rude; politeness costs nothing.
Being unknowing, is not the same as being stupid.
Expressing a contrary opinion, whether to the individual or the group, is more often a sign of deeper thought than of cantankerous belligerence.
Do not mistake your goals as the only goals; your opinion as the only opinion; your confidence as correctness. Saying you know better is not the same as explaining you know better.