Re: the variable is lost

I don't know what's causing this, but you should stay away from $a and $b as variable names, as they are reserved for sort (perlvar).

Furthermore, I don't understand why you are using unix commands in system() despite running on windows.

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Re^2: the variable is lost by cruise (Acolyte) on Mar 09, 2012 at 09:06 UTC
the question is not the variable's name. when i change variable name warning still exist install gnuwin32 you can use ls command in windows	[reply]
Re^3: the variable is lost by Anonymous Monk on Mar 09, 2012 at 09:18 UTC
FWIW, using $a and $b outside of sort is always a mistake	[reply]
Re^4: the variable is lost by eyepopslikeamosquito (Archbishop) on Mar 09, 2012 at 09:36 UTC
FWIW, using $a and $b outside of sort is always a mistake The special variables `$a` and `$b` are also used by List::Util's reduce function and by List::MoreUtils's pairwise function.	[reply] [d/l] [select]
Re^4: the variable is lost by JavaFan (Canon) on Mar 09, 2012 at 10:52 UTC
For a grasshopper, just fresh out of the egg, and not really having a license yet to come anywhere near a keyboard, this is decent advice. It's the level of advice you give to a toddler who's about to start crawling. "Hot, don't touch". Anyone who has half a braincell he can fire up once a blue moon, however, will see how silly that is. A lot of code doesn't sort. Most code that does sort, doesn't even use the variant that makes Perl stuff `$a` and `$b`. And even if you do, even then you have to work hard to make a use of `$a` and `$b` make things mess up. If you really need to have a Pavlov reaction when you see an `$a` and/or a `$b`, and blind yourself from the fact a poster may have used well known example variable names, please keep your urges private, and don't hit that "create" button. It doesn't add any value.	[reply] [d/l] [select]