From: Bart Schaefer <schaefer@brasslantern.com>
To: zsh-users@sunsite.dk
Subject: Re: Slightly OT: Error-Handling in a Pipeline, preferably non-zsh
Date: Mon, 16 Aug 2004 00:41:31 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.61.0408160032060.21654@toltec.zanshin.com> (raw)
In-Reply-To: <FB67F66A-EF34-11D8-83BE-000502631FBD@louisville.edu>
On Sun, 15 Aug 2004, Aaron Davies wrote:
> > ps aux | grep $name | grep -v grep | grep -v $0 |
>
> What do you think of the solution I replied to Phillipe with, using
> xargs with "-r" and just checking the pipestatus to determine exit?
It should work fine. It just isn't what (I thought) you were asking for
-- it still runs both awk and xargs even when the greps find nothing.
> > As a final note, you probably want "$@" in double quotes.
>
> Really? I used it with multi-word commands (like "kill -9") with no
> problems.
What happens when one of the arguments of the command is a quoted word
containing spaces? E.g. supposing your "generalized killall" is named
"runcommandonpidof" (since you've never told us what it _is_ called), try
sleep 30 &
runcommandonpidof sleep print -l "this should be on one line"
(and try it in a non-zsh shell, where word splitting applies; no cheating
by letting zsh preserve the quoting for you, you asked for portability).
next prev parent reply other threads:[~2004-08-16 7:43 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-16 1:04 Aaron Davies
2004-08-16 2:42 ` Bart Schaefer
2004-08-16 3:33 ` Aaron Davies
2004-08-16 7:41 ` Bart Schaefer [this message]
2004-08-16 12:40 ` Aaron Davies
2004-08-16 14:53 ` DervishD
2004-08-17 3:06 ` Bart Schaefer
2004-08-16 3:03 ` Philippe Troin
2004-08-16 3:30 ` Aaron Davies
2004-08-16 7:51 ` Bart Schaefer
2004-08-16 12:41 ` Aaron Davies
2004-08-16 16:08 ` Dan Nelson
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