On 4/3/07, Joe Hart <[EMAIL PROTECTED]> wrote:
-----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?
No, I didn't google out the result so come here to seek some help if possible. And my data file is even more larger. Question: Do you mean column 1. Column 2 doesn't have any duplicate
data in your example.
I just care about duplicated ones in column 2, if so, to delete the line.
