You guys rock! Thanks for all the replies!! I used the code below and it gives me a count of the total unique company IDs, but is there a way to return a list of unique company IDs as well? Please try this... 
#!/usr/bin/perl

use strict; my %count; my $directory = "c:\\Test";
opendir( DIR, $directory )
  || die "Unable to open directory - $!\n";
my @files = grep /\.txt/, readdir( DIR );
closedir( DIR );

open( OUTFILE, ">> $directory\\COID_LIST.txt" )
  || die "Unable to open write file! - $!\n";

foreach my $file (@files) {
    open( FH, "$directory\\$file" )
      || die "Unable to open $file - $!\n";
    while( <FH> ) {
        my $ID = substr( $_, 260, 5 );
        print OUTFILE "$ID\n";
        $count{$ID}++ if ( defined( $ID ) );
    }
    close( FH );
}

print "Number of company ID = " . scalar keys %count;

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In reply to Re^2: Opening multiple files in directory by molson
in thread Opening multiple files in directory by molson

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