In addition to what toolic said you should realize this isn't a code-writing-for-hire website. We want to help you writing perl, not do all the work for you. UPDATE: As usual the "we" is really "some of us" ;-)

To get you started, you might check out perldata for information about hashes (good for matching data from one file in another). Just read in the first file, put the column into the hash and check the hash while reading the second file.