-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Jeff Zhang wrote: > I have a simple txt file, like: > ... > a a > aa a > b b > ba b > ... > > I want to just keep the lines that first appeared in column 2 and delete > the follow lines that contain duplicated ones in column 2. > then it will like: > ... > a a > b b > ... > > I've tried `uniq -f1` but it didn't work.
Question: Are you asking someone to do your homework for you? Question: Do you mean column 1. Column 2 doesn't have any duplicate data in your example. Joe - -- Registerd Linux user #443289 at http://counter.li.org/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFGEki3iXBCVWpc5J4RAu1bAKCEkD8DQbhI1VXYCmoBWuMDPCgQ5wCfUw1j ZenPJCtbGZnGsTRJBtwq694= =hNzi -----END PGP SIGNATURE----- -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
