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From: bak@csd_v.UUCP (Bruce)
Newsgroups: comp.unix.questions,comp.unix.wizards
Subject: Re: PS1 and the bourne shell...
Message-ID: <133@csd_v.UUCP>
Date: Fri, 20-Nov-87 00:12:37 EST
Article-I.D.: csd_v.133
Posted: Fri Nov 20 00:12:37 1987
Date-Received: Mon, 23-Nov-87 03:11:41 EST
References: <279@caus-dp.UUCP> <1926@marque.mu.edu>
Organization: Computer Systems Design -- Sandy Hook, Ct.
Lines: 40
Keywords: Brain dead system...
Summary: ...my version
Xref: mnetor comp.unix.questions:5018 comp.unix.wizards:5540

In article <1926@marque.mu.edu>, nic@marque.mu.edu (Nic Bernstein) writes:
> 						      ^^^^^^
> >won't let us do things like the following...
> >
> >	export ps1
> >	cd()
> >	{
> 		(function deleted)
> >	}
> >
> >The program bombs at the cd() statment and returns the statment:
> >-sh: syntax error: `(' unexpected
> >
> 	I am not sure about Xenix, but Borne usually doesn't support
> functions...

The problem is not that the bourne shell doesn't support sys5 functions,
it's that a function cannot replace a builtin.  If you have ksh you
can use an alias to do the job but in sh you must rename the command.
Thus:

		$ ccd()
		>	{
		>	cd $*
		>	PS1="`pwd`> "
		>   }
		$ ccd /usr/bak
		/usr/bak> pwd
		/usr/bak
		/usr/bak>

will do the job.

However since the cd command is not disabled it is very easy for the
prompt to be inaccurate, because of the tendency to use the 'cd' command
instead of the 'ccd' command.  So although I use a version of this in
MSDOS and VMS systems, I don't use it in a UN*X system.
-- 
Bruce Kern -- Computer Systems Design, 29 High Rock Rd., Sandy Hook, Ct. 06482
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