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find ./ -type d -name "*program*" | while read a
do
grep -l PATTERN $a/*.ext
done

Hi.

A demo script that creates a file, checks it in, modifies it, check in changes:
#!/usr/bin/env bash

# @(#) s1 Demonstrate non-interactive rcs check-in.

# Utility functions:...

In bash/ksh93 you can do this in one command:
diff <(sed -n 20,200p file1) <( sed -n 420,600p file2)

Not an one liner, but, you can do this in two steps.


# extract the required lines, and save in tmp file.

sed -n 20,200p file1 > file1.tmp


# extract the other required line, and diff....