Hi,
On Mon, 7 Aug 2006, Glass, Kevin A wrote:
>
> The Amber 8 User's Guide say that if a "maskstr" contains spaces or
> special characters, then it should be protected by single or double
> quotes (p 244). If I'm using an Amber negation operator '!' with a
> c-shell based system, the '!' symbol should be interpreted as a
> "history" command regardless of the use of single or double quotes.
Yes, that is correct. man blurb:
History substitutions begin with the character `!'. They may begin
anywhere in the input stream, but they do not nest. The `!' may be
preceded by a `\' to prevent its special meaning; for convenience, a
`!' is passed unchanged when it is followed by a blank, tab, newline,
`=' or `('. History substitutions also occur when an input line begins
with `^'. This special abbreviation will be described later. The
characters used to signal history substitution (`!' and `^') can be
changed by setting the histchars shell variable. Any input line which
> Should I use a '\' in front of the '!' to protected from the shell?
Yes \! works:
tcsh> echo '~!.#$%'
.: Event not found.
tcsh> echo '~\!.#$%'
~!.#$%
The tcsh man page suggests other options: especially useful would be !(
For example, ontop of p244:
'[.C= & !(.CA,C)]'
Scott
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Received on Wed Aug 09 2006 - 06:07:09 PDT
