Need a scripting help to sort out a list and list all the duplicate lines. My data looks somethings like this host6:dev406mum.dd.mum.test.com:22:11:11:no host7:dev258mum.dd.mum.test.com:36:17:19:no host7:dev258mum.dd.mum.test.com:36:17:19:no host17:dev258mum.dd.mum.test.com:31:17:19:no host12:dev258mum.dd.mum.test.com:41:17:19:no host2:dev258mum.dd.mum.test.com:36:17:19:no host4:dev258mum.dd.mum.test.com:41:17:19:no host4:dev258mum.dd.mum.test.com:45:17:19:no host4:dev258mum.dd.mum.test.com:36:17:19:no I need to sort this list and print all the lines where column 3 has a duplicate entry. I need to print the whole line, if a duplicate entry exists in column 3. I tried using a combination of "sort" and "uniq" but was not successful. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20091028/099870f5/attachment-0004.html>