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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)'
    
  2. or download this
    =head1 Info
    
    ...
     Example: ./subnet-grep.pl -c 192.168.1.0/255.255.255.0 input1.txt inp
    +ut2.txt
    
    =cut
    
  3. or download this
    perldoc subnet-grep.pl