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thanks zaxxon & rudic, both works.
nope, sure not a homework for me at least. i am new to awk and i feel i really need to sit down and learn the basics. thanks again.

i have the following files (all separated by tabs):

file 1.txt
1 yes
2 no
3 yes
4 yes
file 2.txt
a no
b no
c yes
d no
i combine the above files in file 3 which looks like

file 3.txt...

thanks Scrutinizer. you are correct, it doesn't return anything.

what if i want to grep only 4 lines and put them all in one line? is it possible?

hi,

let's say we have input in files test1.txt, test2.txt, text3.txt ... ... ... ('...' means more files & lines not just 'dots')
test1.txt has:
A
B
C
D
...
...
...

test2.txt has
A
B...