...and here now with reading from and writing to file. I leave the system commands out as I do not know what they are intended for. 

use strict;
my @patterns = ( 'unknown type\(0x134e\)', '30.6511', '\(V6.5.1 FP1\)'
+ );

# now read from file instead
open FILE, "<", "data/04102013_loginlogs.txt" or die "Cannot open inpu
+t file.\n";
my @array = <FILE>;
close(FILE);

# open output file for writing
open OUT, ">>", "output.txt" or die "Cannot open output file.\n";
foreach my $line (@array) { 
  print OUT $line if scalar grep { $line =~ /$_/ } @patterns;
}
close OUT;

[download]

UPDATE: Removed a ) on line 5.

In reply to Re^3: Using grep to pick out Specific lines in a text file by hdb
in thread Using grep to pick out Specific lines in a text file by itguy87

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