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By "subsequent" do you mean corresponding?

Do you need to compare each file with every other file, or just with the one found after it?

find /u/dev/local/abc -name ab.dat | while read LINE
do
if [ ! -z "$PREV" ]
then
...

Oh, I see. You want to compare files in /dev/ with their corresponding files in /test/.

find /u/dev/local/abc /u/test/local/abc -name ab.dat |
sed 's#/u/dev/##g;s#/u/test/##g' | sort -u...