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From: Zoltan Hidvegi <hzoli@frontiernet.net>
To: zsh-users@math.gatech.edu
Subject: Re: zsh vs. ksh coproc redirection semantics
Date: Thu, 7 May 1998 12:10:49 -0500 (CDT)	[thread overview]
Message-ID: <199805071710.MAA48260@frontiernet.net> (raw)
In-Reply-To: <980507021807.ZM16856@candle.brasslantern.com> from Bart Schaefer at "May 7, 98 02:18:06 am"

Bart wrote:
> I'm curious.  In zsh and bash (which also lacks the <&digit- form), <&-
> closes the standard input of whatever command it suffixes, not of the
> shell itself.  Which must mean that (semantically, if not in actual
> implementation) stdin is first dup'd (as it always is when running a
> new command) and then the dup is closed.

When running an external command the stdin is closed after fork thus
not affecting the shell.  Non special builtins should behave like
external commands.

Now the >&p case seems to be special in pdksh, as this does affect the
shell.

It looks like these coproc redirection really works well only with
exec, the rest is implementation dependent.

Zoli


      reply	other threads:[~1998-05-07 17:15 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
1998-05-02 22:24 exit value of intermediate program in pipe 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
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 [this message]

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