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Join On A String

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Join On A String.
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Old Unix and Linux 10-11-2012   -   Original Discussion by jimmyf
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Maybe it should be:

awk 'NR==FNR { A[$1]=$1; next } $1 in A' file2 file1

Sorry, just read the post and thought "this is the error"; just did not test it yet.
(I HATE variable spacing fonts! Had to edit this post too many times just to align the arrow with the error)

Moderator's Comments:
Nope. The code is fine.