Re: Annoying 'Use of uninitialized value in concatenation' warning

... furthermore, controlling this behavior is described in the documentation available at your fingertips:

which also points to perllexwarn

Comment on Re: Annoying 'Use of uninitialized value in concatenation' warning

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Re^2: Annoying 'Use of uninitialized value in concatenation' warning by alain_desilets (Beadle) on Oct 25, 2011 at 20:26 UTC
Thx. I was already familiar with the "no warning 'xyz'", but I hadn't found the names of all the warning categories. Alain	[reply]
Re^3: Annoying 'Use of uninitialized value in concatenation' warning by FunkyMonk (Bishop) on Oct 27, 2011 at 15:05 UTC
If you use diagnostics perl will tell you which category the warning belongs to. For example, printing an uninitialised variable yields (the category is in bold): Use of uninitialized value $x in print at /home/bri/foo.pl line 14 (#1) (W uninitialized) An undefined value was used as if it were already defined. It was interpreted as a "" or a 0, but maybe it was a mistake. To suppress this warning assign a defined value to your variables. Additionally, perldiag lists all of perl's warning and error messages. Perl: perlintro perlretut perldoc Basic debugging checklist Yes, even you can use CPAN PerlMonks: How do I post a question effectively? Markup in the Monastery How do I post a question effectively? I know what I mean. Why don't you? General: How To Ask Questions The Smart Way What every computer scientist should know about floating-point arithmetic To Be Continued...	[reply]