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From: herve@titn.UUCP
Newsgroups: comp.unix.wizards
Subject: Re: prompt changing on the fly
Message-ID: <104@titn.TITN>
Date: Fri, 23-Jan-87 18:57:43 EST
Article-I.D.: titn.104
Posted: Fri Jan 23 18:57:43 1987
Date-Received: Fri, 30-Jan-87 02:27:11 EST
References: <410@moncskermit.oz>
Organization: TITN Inc. Hayward, CA
Lines: 37
Summary: Prompt changing on the fly.



Regarding the prompt setting under csh, here is the way I handle that in 
my login scripts, for what it's worth (all this on a VAX 750, 4.2):

The .login file has the following entries:

	alias	cd	'set old=$cwd; chdir \!*; set prompt = "$Ndirs$cwd> "'
	alias	back	'set back=$old; set old=$cwd; cd $back; unset back'
	alias	ndir	"dirs|wc|sed -e 's/^ *1 *//' -e 's/ .*//'"
	alias	push	'pushd \!*; set Ndirs="`ndir` - "; cd .'
	alias	pop	'popd \!*; set Ndirs="`ndir` - "; cd .'
	set	Ndirs =	"`ndir` - "
	cd .

The prompt is then the current directory preceded by the number of directories
currently on the stack (as I never remember what I'm doing with pushd and popd,
that's an information I find quite useful...).  The back command allows me to 
switch between the last two directories I used.

I did not put a "set prompt = xxxx" in my .cshrc script. In this case, the
standard '%' prompt reminds me, when I see it, that I am in a subshell.

For people who heavilly use pushd and popd and who cannot afford the delay
in the execution of ndir, just use:

	alias	cd	'set old=$cwd; chdir \!*; set prompt = "$cwd> "'
	alias	back	'set back=$old; set old=$cwd; cd $back; unset back'
	alias	push	'pushd \!*; cd .'
	alias	pop	'popd \!*; cd .'
	cd .

instead of the above, and push and pop will be faster.

FROM:	Herve Siegrist, TITN Inc.  24301 Southland Dr. Suite 200
	Hayward, CA 94545	Tel: (415) 785-5970
UUCP:	(decvax|ucbvax|ihnp4)!decwrl!sun!dlb!plx!titn!herve