Shell Programming and Scripting

No,
it's because you're using (t)csh. You should escape the bang:

Code:

awk '\!x[$1]++' infile

I am sorry again , I am getting a different error this time

awk '\!x[$1]++' ami am ( these are the two files )
awk: syntax error near line 1
awk: bailing out near line 1


Could you please let me know what the real; problem will be .

This is because you're using an old, broken awk.
Try executing the same command with nawk:

Code:

nawk '\!x[$1]++' ami am

Thanks a lot radoulov....it worked this time and i could get the output on screen

-----Post Update-----

SOrry , I am not trying to bump this thread.....but could it be possile through diff command

e.g

diff ami am ..i know this will list the difference ..(of cource we want the difference ) there are a lot of other characters..like 1,5c1, 6 and < > ..could we remove them ??

and get a file like

hello
shellp
pello
kello
lailo
akfdg
rferg
qwdrfw
dfbnrgw
dfbsrth
iuultui


instead of

1,5c1,6
< hello
< shellp
< pello
< kello
< lailo
---
> akfdg
> rferg
> qwdrfw
> dfbnrgw
> dfbsrth
> iuultui