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exitafter theprintstatement in your awk script then it won't have to read the rest of file1.txt discarding every line and so it'd be much more efficient.tr "\n" ","changes it's input into something that is no longer a valid test file per POSIX (no terminating newline) so YMMV regarding what sed or any other text-processing tool does with it as that's then undefined behavior. You'll probably be OK with GNU sed, idk about others.paste -s -d , -in place of thetrcommand would solve the issue that @EdMorton points out (and also makes yoursedcall at the end superfluous). I have not looked at the rest of your code though.