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Possible Duplicate:
How do I use boolean variables in Perl?
[root@ ~]$ perl -e 'if(true){print 1}'
1
[root@ ~]$ perl -e 'if(false){print 1}'
1
I'm astonished both true and false passes the if...
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In most of the programming language True and False are considered as the boolean values. But Perl does not provide the type boolean for True and False. In general, a programmer can use the term “boolean” when a function returns either True or False.
Perl does not have a special boolean type and yet, in the documentation of Perl you can often see that a function returns a "Boolean" value. Sometimes the documentation says the function returns true or returns false.
What is true/false in Perl. In short, the following elements evalue to false in Perl: The number zero (0) means false. The string zero ('0' or "0") means false.
Always use warnings, especially on one-liners.
Perl has no true or false named constants, and without warnings or strict enabled, a "bareword" (something that could be a constant or function but isn't) is silently interpreted as a string. So you are doing if("true") and if("false"), and all strings other than "" or "0" are true.
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