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>From suter  Mon Nov 26 16:19:24 2001
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Date: Mon, 26 Nov 2001 16:05:43 +1000
To: general at lists.humbug.org.au
Subject: Re: [H-GEN] change directory shell script reverting to orginal directory
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In-Reply-To: <4.3.2.7.2.20011126145301.00b1a0f8 at mail.bigpond.com>; from easo.thankachen at mat-man.com.au on Mon, Nov 26, 2001 at 03:39:33PM +1000
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From: Anthony Towns <aj at azure.humbug.org.au>
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On Mon, Nov 26, 2001 at 03:39:33PM +1000, Easo Thankachen wrote:
> I had a feeling it was landing back in the parent shell.

You are, yes. You could avoid that by making your script be:

	#!/bin/sh

	cd $1
	exec bash

which would keep you in a sub-shell each time, and would mean you'd have to
type exit once for each invocation of that script to log out.

> I tried taking of the #!/bin/sh , but that did not help. The solution you 
> suggested seems to be shell specific.

Yes, the solution's always shell specific. A script is just a special
sort of program, and program's don't get to mess with the insides of
whatever program invoked them, generally speaking. If you want to mess
with the insides of your shell, you need to do it specially, and the way
to do that is by "sourcing" the script, rather than executing it.

	$ . /usr/local/bin/cwd

is the POSIX sh way of doing it (should work in sh, bash, ksh, zsh).

	$ source /usr/local/bin/cwd

is a bash alias for it.

> Would there be some command/directive that will force the script to be 
> executed in the same shell.
> Such a simple script probably should not be shell specific.

It's always shell specific. It has to be shell specific to be able to
muck around with the internals of the shell without breaking things.

Cheers,
aj

-- 
Anthony Towns <aj at humbug.org.au> <http://azure.humbug.org.au/~aj/>
I don't speak for anyone save myself. GPG signed mail preferred.

 "Security here. Yes, maam. Yes. Groucho glasses. Yes, we're on it.
   C'mon, guys. Somebody gave an aardvark a nose-cut: somebody who
    can't deal with deconstructionist humor. Code Blue."
		-- Mike Hoye,
		      see http://azure.humbug.org.au/~aj/armadillos.txt

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