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You could certainly do it in awk, but it's easier to just use join:
join -t, -j1 -a 1 -a 2 file1 file2

(unless I'm forgetting something, which I usually do :p)

Hi stack,

Using 'Perl':


$ cat file1
111,Mike,Stipe
222,Peter,Buck
333,Mike,Mills
$ cat file2
222,Mr,Bono
444,Mr,Edge
$ cat stack.pl
use warnings;
use strict;

die qq[Usage: perl $0...