Re: Re: Anyone use "xor" in conditionals?

[BUU]

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[Abigail-II]

$ perl -we"print 'omg' if -d 'bcc' == -d 'cygwin'" 
Use of uninitialized value in numeric eq (==) at -e line 1.
Use of uninitialized value in numeric eq (==) at -e line 1.
omg$ ls bcc cygwin
ls: bcc: No such file or directory
ls: cygwin: No such file or directory
$

Abigail

[jsprat]

Try it with a non-existent directory. Perl will warn if you do a numeric comparison with an undefined expression, while undef will evaluate as false in a boolean comparison.

HTH

PS Change the 'if' in your original node to 'unless', but I'm guessing you already know that...