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how to replace tab by '\t' (literally) with tr?

From: Peng Yu
Subject: how to replace tab by '\t' (literally) with tr?
Date: Mon, 28 Dec 2009 15:21:54 -0600 
I have the following file head.txt. I'm wondering what the correct way
is to change the tab to a backslash and the character 't'.

$ tr "\t" "\\t" <head.txt
                        a       a       b       c               
$ cat head.txt
                        a       a       b       c
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