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Hi ,

diff -U 2 file1 file2 | awk '/^\ / {print $0}' >> file3

diff -U 2 file1 file2 | awk '/^-/ {print $0}' >> file4

Thanks&Regards
Naree

Oops, I found a thread posted by Ygor

awk -F " " 'BEGIN{while(getline<"file1") a [$1]=1 } ; a [$1] !=1 {print $2 } ' file2

This command works great.

One quick approch:

grep -v "$(cat file1)" file2 | awk '{print $2}'