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From: Tim Goodwin <tjg@star.le.ac.uk>
To: buggs-rc@splashground.de
Cc: rc@hawkwind.utcs.toronto.edu
Subject: Re: Beta release rc-1.6b3 available
Date: Wed, 17 Oct 2001 09:34:45 -0500	[thread overview]
Message-ID: <20011017133445.9850.qmail@happy.star.le.ac.uk> (raw)
In-Reply-To: <20011017152124.15258.qmail@mail.splashground.de> (buggs-rc@splashground.de)

> Suse Linux 7.2 with a CVS gcc-3.1 from last week does fine.

Thanks for the report.  (Keep 'em coming, folks!)

> But there are some issues, not version dependant, that I don't understand.
> This will get out of control:
> 
> ; fn l {ls -l $*}
> ; fn l {l -a $*}
> ; l

Your function `l' always calls itself recursively, so it rapidly runs
out of stack.

Remember that, unlike other shells, rc is not a macro processor.  In
particular, the `l' in the function body of your second definition is
*not* expanded using the previous definition of `fn l'.  (You can
always use `whatis' to see the current definition of a function.)

A simple

    fn l { ls -la $* }

is probably what you want.

Also, check out the `builtin' builtin, which allows a function to call
a builtin or external command of the same name without recursing:

    fn ls { builtin ls -F $* }

> And what about job control, how do I handle that?

This shell does not have job control.

It has been said (by Duff? Pike? Rakitzis? I forget...) that job
control adds a deal of complexity to handle just the easy part of a
hard problem.  The suggested alternative in a windowing environment is
to open a new window.

If you're not in a windowing environment, you might like the `screen'
program, which does both the easy and hard parts of the problem.
There's also a "tabbed" version of gnome-terminal around, called
`multignometerm'.

Tim.


  reply	other threads:[~2001-10-18  5:56 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-10-15 13:56 Tim Goodwin
2001-10-17 14:13 ` Buggs
2001-10-17 14:34   ` Tim Goodwin [this message]
2001-10-17 21:13     ` Buggs
     [not found] ` <20011019004843.A429@gc.wirefire.com>
2001-10-19 17:14   ` Tim Goodwin
2001-10-22  6:47     ` Scott Schwartz
2001-10-24  3:25       ` Chris Siebenmann
2001-10-24  3:41         ` Scott Schwartz
2001-10-23  7:55 ` Carlo Strozzi
2001-10-23 12:44   ` Tim Goodwin
2001-10-23 21:32     ` Carlo Strozzi
2001-10-24  3:34       ` Chris Siebenmann
2001-10-24  8:04         ` Carlo Strozzi
2001-10-23 15:47   ` Markus Friedl
2001-10-23 21:09     ` Carlo Strozzi
2001-10-23 15:55   ` Sam Roberts
2001-10-23 21:14     ` Scott Schwartz
2001-10-26 23:57 Gary Carvell

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