I have 2 files and want to create another file comparing
these 2 source files.

file1 is subset of file2.

file1 - (60,000 lines)

123
234
345
678

file2 - (16 mill lines)
A|12|r|some|56|78|90
E|123|r|some|56|78|90
D|678|r|some|56|78|90
C|12|r|some|56|78|90
F|345|r|y|98|0|0

Output is this.

E|123|r|some|56|78|90
D|678|r|some|56|78|90
F|345|r|y|98|0|0


I have written a script but its taking more than 2
weeks to execute on a SUN Solaris server. Here the
code please suggest a faster way to do it. 
 
#! /bin/perl
$DATA_DIR = "/export/home/data";
$Dump_Data = "/export/home/data/Dump";
$HSS_Data = "/export/home/HSS/data";
$File2 = "$Dump_Data/File2";

open IN1,"cat $File1|" or die "Can't open $File1: $!\n";
open (OUT1, ">>File3.txt") or die "Can't open $File3.txt: $!\n";

while ($line1 = <IN1>) {
    chomp($line1);
    open IN2,"cat $File2 |" or die "Can't open $File2: $!\n";
    while ($line2 = <IN2>) {
        if ($line2 =~ /$line1/) {
            print OUT1"$line2";
            last;
        }
    }
    close(IN2);
}
close(IN1);

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In reply to Compare 2 files and create a new one if it matches by shawshankred

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