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'Return value of "open" ignored at line 188, column 3.  Check the retu
+rn value of "open" for success.  (Severity: 3)'
'Readline inside "for" loop at line 51, column 16.  See page 211 of PB
+P.  (Severity: 4)'
'Bareword file handle opened at line 120, column 2.  See pages 202,204
+ of PBP.  (Severity: 5)',
'Two-argument "open" used at line 120, column 2.  See page 207 of PBP.
+  (Severity: 5)',
'Two-argument "open" used at line 188, column 3.  See page 207 of PBP.
+  (Severity: 5)'

=head1 Info

...
 Example: ./subnet-grep.pl -c 192.168.1.0/255.255.255.0 input1.txt inp
+ut2.txt

=cut

perldoc subnet-grep.pl