Always use strict and use warnings in your perl code!
Always use warnings in your Perl code!
Argument ... isn't numeric in numeric ...
Can't locate ... in @INC
How to capture and save warnings in Perl
Installing and getting started with Perl
Name "main::x" used only once: possible typo at ...
Possible precedence issue with control flow operator
Safety net (use strict; use warnings;)
Test for warnings in a Perl Module
Unknown warnings category
Use of uninitialized value
Useless use of hash element in void context
Why does this code not work? (split, array slice) - Solution
readline() on closed filehandle in Perl
use strict; and warnings; but no diagnostics
Common Errors and Warnings
Test for expected warnings