uniq the file content

Shell Programming and Scripting
1

Hi
I want to uniq the content of a file based on 4th field

a.txt

abcd,123,456,234,asd
defg,123,456,235,asd
abcd,123,456,234,asd,lkjl,ijk
ijkl,123,456,234,asd
defg,123,456,235,asd,dfg,klm

o/p will be like

abcd,123,456,234,asd
defg,123,456,235,asd
ijkl,123,456,234,asd

or

abcd,123,456,234,asd,lkjl,ijk
ijkl,123,456,234,asd
defg,123,456,235,asd,dfg,klm

pls help

2

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3

According to your question , if you need based on 4th field, then

output will be

ijkl,123,456,234,asd
defg,123,456,235,asd,dfg,klm
4

use this code:-

nawk '
!a[$1$4]++
' input_file

Best Regards

5

Pls add, -F",".

6

thanks panyam sorry I forget :-

nawk -F"," '
!a[$1$4]++
' input_file
7

Hi when i am giving this comman i m getting error like

nawk -F"," '!a[$1$4]++' test
a[: Event not found.