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| P is for Practical | |
| PerlMonks |
Re: Re: Re: Anyone use "xor" in conditionals?by jsprat (Curate) |
| on Jul 14, 2003 at 23:41 UTC ( [id://274226]=note: print w/replies, xml ) | Need Help?? |
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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...
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