Jakub Narebski wrote:

quoted text
> We have to go to quote.c to get to know why "!" is a special case too,
> in addition to "'".  The commit message for 77d604c3 (by H. Peter Anvin,
> which is CC-ed) states:
> 
>     Create function to sq_quote into a buffer
>     Handle !'s for csh-based shells

Although according to POSIX 

  Enclosing characters in single-quotes ( '' ) shall preserve the literal
  value of each character within the single-quotes. A single-quote cannot
  occur within single-quotes.

so "!" should be not treated as special character in POSIX shell,
csh unfortunately does not follow this.  Try

  $ echo '!!'

in csh, tcsh (now that's funny) and bash (or dash).

-- 
Jakub Narebski
Poland
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