I am getting this at the end of the perl output 

Can't use an undefined value as a subroutine reference at ./error_chec
+ker.pl line 34.

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The line 34 is this. I actually did not understand this as well

$errors{$program_output3}; # lowercase, just in case

In reply to Re^2: Perl 5.10.1 - compare external program output with a list of known error codes by malokam
in thread Perl 5.10.1 - compare external program output with a list of known error codes by malokam

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