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
Can't use string (...) as an HASH ref while "strict refs" in use at ...
Create a lexical warning that can be turned on and off with the "warnings" pragma.
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;) - video
Test for warnings in a Perl Module
Unknown warnings category
Use of uninitialized value
Useless use of hash element in void context
Useless use of private variable in void context
Why does this code not work? (split, array slice) - Solution
readline() on closed filehandle in Perl
substr outside of string at ...
use strict; and warnings; but no diagnostics
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