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There are already several tools to achieve what you want, writing your own is probably needless.

A standard Unix-like solution (works under bash):
$ diff <( sort master ) <( sort completed ) | grep '^<' | cut -d ' ' - +f2-

Depending on your needs you may want to use sort -u instead of a simple sort.

Or if you're under some Debian-derivative distro just install the moreutils package and use combine:

$ combine master not completed 1ao8A 1jkxA 1juvA 1mejA 1meoA 1n0uA 1pjqA

Hope that helps.


In reply to Re^3: Pulling out data from one file thats not in another by rubasov
in thread Pulling out data from one file thats not in another by Angharad

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