From: "Bart Schaefer" <schaefer@brasslantern.com>
To: Sweth Chandramouli <sweth@astaroth.nit.gwu.edu>,
zsh-users@math.gatech.edu
Subject: Re: exit value of intermediate program in pipe
Date: Sun, 3 May 1998 02:30:14 -0700 [thread overview]
Message-ID: <980503023014.ZM31001@candle.brasslantern.com> (raw)
In-Reply-To: <19980503021749.21621@astaroth.nit.gwu.edu>
On May 3, 2:17am, Sweth Chandramouli wrote:
} Subject: Re: Re: exit value of intermediate program in pipe
}
} isn't this what wait was designed for?
}
} foo () {
} /bin/blah >>(grep -v "foo")
} wait
} }
That doesn't work, because process substitutions [which is what >>(...)
is] and command substitutions [`...` and $(...)] are not placed in the
job table. The wait command only waits for jobs that were backgrounded
with &. (This could be considered a bug, I suppose.)
} what exactly is the syntax that >> uses to become a pipe
When the >> is immediately followed by a parenthesized command list, it
means pipe to that list. There's also >(...) which uses a FIFO.
This is in the zsh tekinfo documentation, under "Process Substitution".
For input, <<(...), <(...), and =(...) use a pipe, a FIFO, and a temp
file, respectively.
} the way you describe it looks a lot like a ksh two-way pipe
Not having used ksh much and never having seen any ksh doc, I'm not sure
what that means; but the pipe isn't two-way.
} as i mentioned in my other
} reply to this thread, i've never been able to get |& to work
That just means redirect both stdout and stderr as the pipe input. It is
a csh-ism, and not equivalent to the ksh syntax. See the FAQ. (I think
that means that you want the "coproc" builtin and <&p and >&p redirection
for setting up a "two-way pipe.")
--
Bart Schaefer Brass Lantern Enterprises
http://www.well.com/user/barts http://www.brasslantern.com
next prev parent reply other threads:[~1998-05-03 10:21 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-05-02 22:24 Steve Talley
1998-05-03 0:50 ` Sweth Chandramouli
1998-05-03 1:38 ` Timothy J Luoma
1998-05-03 2:08 ` Bart Schaefer
1998-05-03 6:17 ` Sweth Chandramouli
1998-05-03 9:30 ` Bart Schaefer [this message]
1998-05-03 22:15 ` Sweth Chandramouli
1998-05-04 1:35 ` Bart Schaefer
1998-05-04 4:54 ` Sweth Chandramouli
1998-05-04 9:43 ` Bernd Eggink
1998-05-04 11:42 ` Bart Schaefer
1998-05-04 12:03 ` Bernd Eggink
1998-05-04 15:59 ` Bart Schaefer
1998-05-05 11:39 ` Bernd Eggink
1998-05-05 17:03 ` zsh vs. ksh coproc redirection semantics Bart Schaefer
1998-05-06 10:47 ` Bernd Eggink
1998-05-06 16:00 ` Bart Schaefer
1998-05-07 7:17 ` Zoltan Hidvegi
1998-05-07 8:34 ` Andrew Main
1998-05-07 9:26 ` Bart Schaefer
1998-05-07 9:34 ` Andrew Main
1998-05-07 17:02 ` Zoltan Hidvegi
1998-05-07 9:18 ` Bart Schaefer
1998-05-07 17:10 ` Zoltan Hidvegi
1998-05-05 11:54 exit value of intermediate program in pipe Bernd Eggink
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