From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: Zsh hackers list <zsh-workers@zsh.org>
Subject: "echo | ps -j $(:) | cat | cat | cat" runs components in different process groups
Date: Fri, 23 Mar 2018 16:16:13 +0000 [thread overview]
Message-ID: <20180323161612.GB4857@chaz.gmail.com> (raw)
From
https://unix.stackexchange.com/questions/411688/zsh-cant-input-to-terminal-when-piping-stdin-and-stdout-with-variable-command-t
$ echo | ps -j $(:) | cat | cat | cat
PID PGID SID TTY TIME CMD
4858 4858 4858 pts/4 00:00:02 zsh
23813 23813 4858 pts/4 00:00:00 zsh
23895 23895 4858 pts/4 00:00:00 ps
23896 23896 4858 pts/4 00:00:00 cat
23897 23897 4858 pts/4 00:00:00 cat
23898 23898 4858 pts/4 00:00:00 cat
See how they all run in different process groups (they should
all be in the same one, same job).
Note that the conditions to reproduce the problem seem to be
quite specific:
- the first pipeline component must be a builtin or compound command
- the second component must have a command substitution in the
arguments (OK when in targets of redirections).
(tested with git head on Debian amd64)
--
Stephane
next reply other threads:[~2018-03-23 16:16 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-23 16:16 Stephane Chazelas [this message]
2018-03-23 23:36 ` Bart Schaefer
2018-03-24 5:19 ` Bart Schaefer
2018-03-24 8:05 ` Joey Pabalinas
2018-03-24 17:34 ` Stephane Chazelas
2018-03-24 22:23 ` Bart Schaefer
2018-03-25 7:00 ` Stephane Chazelas
2018-03-25 8:26 ` Stephane Chazelas
2018-03-25 7:48 ` Stephane Chazelas
2018-03-25 18:09 ` Stephane Chazelas
2018-03-27 10:17 ` Stephane Chazelas
2018-03-24 22:09 ` Bart Schaefer
2018-04-10 11:45 ` Peter Stephenson
2018-04-10 13:59 ` Peter Stephenson
2018-04-11 22:10 ` Bart Schaefer
2018-04-12 16:23 ` Peter Stephenson
2018-04-15 16:23 ` Stephane Chazelas
2018-04-15 17:38 ` Bart Schaefer
2018-04-15 18:58 ` Stephane Chazelas
2018-04-17 5:39 ` Bart Schaefer
2018-04-17 9:19 ` Peter Stephenson
2018-04-17 16:09 ` Bart Schaefer
2018-04-17 16:27 ` Bart Schaefer
2018-04-17 16:35 ` Peter Stephenson
2018-04-17 17:52 ` Bart Schaefer
2018-04-19 9:40 ` Peter Stephenson
2018-04-20 9:28 ` Forking earlier for background code Peter Stephenson
2018-04-20 10:01 ` Peter Stephenson
2018-04-20 12:54 ` Vin Shelton
[not found] ` <CGME20180420132008eucas1p1c297624e870975cd892c74254970faab@eucas1p1.samsung.com>
2018-04-20 13:20 ` Peter Stephenson
2018-04-20 16:01 ` Vin Shelton
2018-04-23 8:29 ` Peter Stephenson
2018-05-01 9:23 ` Peter Stephenson
[not found] ` <F3A62E38-24E2-4A62-8E19-F54C9B81E9E5@kba.biglobe.ne.jp>
2018-04-23 13:52 ` "echo | ps -j $(:) | cat | cat | cat" runs components in different process groups Peter Stephenson
2018-04-23 14:03 ` Peter Stephenson
[not found] ` <CGME20180423140859eucas1p2591bf1422614209979d4890383268c37@eucas1p2.samsung.com>
2018-04-23 14:08 ` Peter Stephenson
2018-04-23 15:29 ` Jun T.
2018-04-18 6:29 ` Stephane Chazelas
2018-04-18 16:33 ` Bart Schaefer
2018-04-10 9:53 ` Peter Stephenson
2018-03-25 7:38 ` Stephane Chazelas
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