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Thanks for sharing. Does seem harmless but do test before using because I found it removed the last "COMMIT" line so if you expect the rule set to be loaded on boot it may fail to complete for not seeing that line...
I'm out if my comfort zone here, but I don't think the code in that link works (actually, it is more that the idea does not work). I think if you run it against a set of rules that has duplicates in different chains, which you would have done deliberately, it will remove those dupes.
Safer done manually, for any reasonable number of rules.
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iptables duplicate rules.
