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and this command did the trick...comm -3 file1 file2 >> file2
thanks

Can i do the same with diff command...
what -3 in that command do?

Thanks...exactly what i require...excellent job.

need some clarification....what does this statement do dd if=$1 of=temp.$$ bs=1 skip=$offset count=$size > /dev/null 2>&1

Hi
i need to have a update for a file that updates only the last modified content from another file....

say for example....if file A is having content like
.
.
.
hatxxxx
catxxxx
ratxxxx...