I see, another way to the answer is via Basic debugging checklist 

$ perl -MO=Deparse,-p

ok( ! $mode & 022, "File is not group or world writable" );
^Z
ok(((!$mode) & 18), 'File is not group or world writable');
- syntax OK

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In reply to Re: Testing for group or world writable files by Anonymous Monk
in thread Testing for group or world writable files by neilwatson

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