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From: Bruce Stephens <b.stephens@isode.com>
To: zsh-users@math.gatech.edu
Subject: Re: jobs command and pipes
Date: 30 Oct 1998 15:08:49 +0000	[thread overview]
Message-ID: <vbk91irsse.fsf@snake.isode.com> (raw)
In-Reply-To: "Owen M. Astley"'s message of "Fri, 30 Oct 1998 14:36:05 +0000 (GMT)"

"Owen M. Astley" <oma1000@cam.ac.uk> writes:

> Why is it that the jobs command in zsh will not work with a pipe,
> although redirecting it to a file does work?

>From a practical point of view, it's surely obvious.  You can
implement

	A | B

by forking twice, redirecting I/O appropriately in the two children,
and then one child executes A, and one executes B.  I suspect

	jobs | wc

*does* work.  But the child process shell which executes the builtin
jobs doesn't have any jobs, so the result isn't interesting.

	jobs > foo

doesn't require jobs to be executed in a subshell, so it'll work as
expected.  (i.e., you get the list of jobs in the current shell,
rather than the empty list of jobs in a newly forked shell.)

So I think it's logical; probably a feature rather than a bug.  If
it's a bug, I wouldn't expect a fix soon.


      parent reply	other threads:[~1998-10-30 15:16 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <199810301148.LAA20596@diamond.tao.co.uk>
1998-10-30 12:43 ` zsh-3.1.5 released Geoff Wing
1998-10-30 14:36   ` jobs command and pipes Owen M. Astley
1998-10-30 15:03     ` Zefram
1998-10-30 16:14       ` Stefan Monnier
1998-10-30 17:01         ` Zefram
1998-10-30 22:14           ` Dan Nelson
1998-10-30 15:08     ` Bruce Stephens [this message]

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