#!/usr/bin/perl
use File::Copy;
use strict;
my (@col, @vals, $val, $i);
open(COL, "<replace.txt");

while(<COL>) {
    chomp($_);
    (@vals) = split(":", $_);
    push @col, $vals[1]; #store values for column 2

}
close(COL);

open(OUT, ">out.txt");
open(COL, "<original.txt");
while(<COL>) {
    chomp($_);
    (@vals) = split(":", $_);
    $vals[2] = $col[$i++];    #replace values in column 3
    print OUT join(":", @vals) . "\n";
}
close(COL);
close(OUT);
copy("out.txt", "original.txt");