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Undocumented usage of printf?

From: Clark J. Wang
Subject: Undocumented usage of printf?
Date: Thu, 15 Apr 2010 22:21:29 +0800

I saw a printf usage from a Linux forum's post:

# printf "%d\n" "'a"

It's really cool but I found no info in bash's manual. Are there any other
undocumented interesting features? :)

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