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  1. or download this
    grep 'gateway' infile > outfile
    
  2. or download this
    perl -ne'print if /gateway/' infile > outfile
    
  3. or download this
    perl -ne"print if /gateway/" infile > outfile
    
  4. or download this
    # Usage: script.pl infile outfile
    # or
    ...
          print $fh_out $_;
       }
    }