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Find duplicates in a list

From: Sam Ravnborg
Subject: Find duplicates in a list
Date: Sun, 27 Jul 2014 11:58:59 +0200
User-agent: Mutt/1.5.23 (2014-03-12)

Hi all.

I'm trying to find a way to detect duplicate items in a list without
escaping to a shell.

Consider the following:

list := A B C A D C

In the list above A and C is duplicated.
I would like to find a way so I can find which items are duplicated and print 
them out.

The solution should preferably work with gmake 3.81 and even better in make 3.80

Thanks in advance,


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