Hello,
I am using Awk in UBUNTU 12.04.
I have a file as following with 48,432,354 lines and 4 fields.
The file has this structure (There are repetitions of the first column in several lines)
AB_14 S54 A G
AB_14 S55 A A
AB_14 S56 G G
GO_15 S45 T A
GO_15 S46 A A
PT_16 S33 C C
PT_16 S34 G A
PT_16 S35 T T
PT_16 S36 T A
What I want to have as an outcome is this:
AB_14 S54 A G
GO_15 S45 T A
PT_16 S33 C C
That is to have a file only with the first lines of the first file. To mention, I have a file only with the list of names of the first file like this if that can be useful.
AB_14
GO_15
PT_16
Thank you very much in advance.