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Re: Escaping the history expansion character

From: Chet Ramey
Subject: Re: Escaping the history expansion character
Date: Sun, 08 Aug 2004 22:08:18 -0400
User-agent: Mozilla/5.0 (Windows; U; Win 9x 4.90; en-US; rv:1.6) Gecko/20040113

Matthew Walker wrote:

 From the bash info page:
  Only `\' and `'' may be used to escape the history expansion

I have tried the following:
  echo '!'   # works fine, displays "!"
  echo "!"   # errors as expected with "event not found"
  echo "\!"  # produces "\!" --- this is my problem

Why is it that "\!" doesn't output just "!"?

For every other scenario "\x" produces "x". Why does this fail for an exclamation mark?

Because `!' is not one of the characters for which the backslash retains
its meaning as an escape character when in double quotes.



for that list of characters.

This is one of the places where the csh-derived history expansion
collides with bash's sh-based syntax.


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