From: Vincent Lefevre <vincent@vinc17.net>
To: zsh-users@zsh.org
Subject: Re: detect pipe
Date: Sun, 14 Feb 2021 18:31:38 +0100 [thread overview]
Message-ID: <20210214173138.GA2298446@zira.vinc17.org> (raw)
In-Reply-To: <CAH+w=7aXd5i5vz5k++-4G=Ow4VfYE2q_s2dGLKHK_zG=Ox1VVQ@mail.gmail.com>
On 2021-01-30 11:00:15 -0800, Bart Schaefer wrote:
> On Sat, Jan 30, 2021 at 6:27 AM Ray Andrews <rayandrews@eastlink.ca> wrote:
> >
> > Cool stuff Bart. Would you please elaborate on 'Close stdin'?
>
> ubuntu% ls /dev/fd/0
> /dev/fd/0
> ubuntu% ls /dev/fd/0 <&-
> ls: cannot access '/dev/fd/0': No such file or directory
>
> File descriptor zero, the standard input, has been closed; it
> literally does not exist for "ls" (in this example). If it's closed,
> it's not possible to read from it:
>
> ubuntu% cat <&-
> cat: -: Bad file descriptor
> cat: closing standard input: Bad file descriptor
>
> Most commands will ignore a closed stdin and behave similarly to
> reading from /dev/null.
Closing stdin is a bad idea, as this can break stdout redirection,
and this may be out of control of the commands. See
https://sourceware.org/bugzilla/show_bug.cgi?id=682
--
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
next prev parent reply other threads:[~2021-02-14 17:32 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-27 16:45 Ray Andrews
2021-01-27 23:59 ` Bart Schaefer
2021-01-28 4:57 ` Ray Andrews
2021-01-28 6:16 ` Bart Schaefer
2021-01-28 10:08 ` Vincent Lefevre
2021-01-28 10:28 ` Vincent Lefevre
2021-01-28 15:05 ` Ray Andrews
2021-01-28 15:45 ` Ray Andrews
2021-01-28 20:58 ` Bart Schaefer
2021-01-28 20:59 ` Bart Schaefer
2021-01-29 1:17 ` Ray Andrews
2021-01-29 2:50 ` Bart Schaefer
2021-01-29 3:21 ` Ray Andrews
2021-01-30 0:29 ` Bart Schaefer
2021-01-30 14:26 ` Ray Andrews
2021-01-30 19:00 ` Bart Schaefer
2021-01-30 19:19 ` Ray Andrews
2021-01-31 19:12 ` Ray Andrews
2021-01-31 21:28 ` Bart Schaefer
2021-02-14 17:31 ` Vincent Lefevre [this message]
2021-02-14 19:33 ` Bart Schaefer
2021-02-14 20:33 ` Ray Andrews
2021-02-14 21:20 ` Bart Schaefer
2021-02-14 22:25 ` Ray Andrews
2021-02-14 21:24 ` Vincent Lefevre
2021-02-14 21:19 ` Vincent Lefevre
2021-02-14 21:24 ` Bart Schaefer
2021-02-14 21:38 ` Bart Schaefer
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