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Why sh-set-shell insert a space after #!

From: Leo
Subject: Why sh-set-shell insert a space after #!
Date: Fri, 17 Aug 2012 12:05:08 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.2 (OS X 10.8)

Hello all,

If you M-x sh-set-shell in a buffer it inserts something like:

  #! /bin/bash

I am curious why a space after #!. I read this page:
http://en.wikipedia.org/wiki/Shebang_(Unix). The newsgroup post by
Dennis Ritchie also has a space. But most scripts I have seen do not. So
I am curious ;)


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