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From: rbj@icst-cmr.arpa (Root Boy Jim)
Newsgroups: comp.unix.questions
Subject: C-shell on System V shell
Message-ID: <10448@brl-adm.ARPA>
Date: Thu, 19-Nov-87 15:45:41 EST
Article-I.D.: brl-adm.10448
Posted: Thu Nov 19 15:45:41 1987
Date-Received: Sun, 22-Nov-87 02:40:09 EST
Sender: news@brl-adm.ARPA
Lines: 36


   Does anyone have shell scripts which emulate C-shell functions on the
   System V shell?

   In particular, I need the history capability of the C-shell on my System
   V shell, but any other emulations are welcome, as from them I might be
   able to write my own.

When I was forced to use the Bourne shell on System V, I considered
writing an input filter for the shell, which would be executed like so:

			prog | sh -i

The -i says that this really is an interactive shell, even tho it doesn't
look like one because its stdin isn't a tty.

Mostly, the filter acts like cat, but every so often, it does something
useful. Normally, it remembers all commands; if a later command should
contain a `!' anywhere in the line, it would perform history substitution
before sending it to the shell. Additionally, aliases could be handled
the same way. The `cd' command could automatically set PS1. `Pushd', `popd',
and `dirs' could be handled as well.

Certain commands must be exec'ed directly, such as `vi' or `emacs'
because they require a tty to do ioctls to.

   Thanks in advance,

Good luck.

   Arun Chandra (arunc@uxc.cso.uiuc.edu)

	(Root Boy) Jim Cottrell	<rbj@icst-cmr.arpa>
	National Bureau of Standards
	Flamer's Hotline: (301) 975-5688
	I'm gliding over a NUCLEAR WASTE DUMP near ATLANTA, Georgia!!