I have a .sh file with the following contents:
a
b
c
a
a
b
d
c

i want to delete the multiple occurances and keep one. say there are 3 a's in the file. I want to delete 2 of them and just keep 1 occurance.

sort -u a.sh


cheers,
Devaraj Takhellambam

thanks

if the file is like

a
c
b
check interface a
check interface b

and i want to perform the same action for both a and check interface a , thus i need to keep only one of them in my file. how do i do a sort in that case

u need to understand the patter that precedes the text and remove it.

sed 's/check interface //g' dupsed | sort -u

cheers,
Devaraj Takhellambam

can u expalin alitlle about dupsed. what does it do