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  1. or download this
    % perl5.6.1 -w test.pl
Use of uninitialized value in substr at test.pl line 14.
...

% perl5.6.1 test.pl
Segmentation fault (core dumped)
  2. or download this
    #!/usr/bin/perl
use strict;
...
Not-OK: a
Not-OK:
Segmentation fault (core dumped)