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From: Martijn Dekker <martijn@inlv.org>
To: Bart Schaefer <schaefer@brasslantern.com>
Cc: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: $PPID not updated when the PPID changes (parent killed)
Date: Tue, 18 May 2021 21:40:59 +0200	[thread overview]
Message-ID: <8f589df8-7301-6802-7576-aca96c142ca8@inlv.org> (raw)
In-Reply-To: <CAH+w=7YwR8J=dGyRThS1A1ebVAHXS8hjKMaSwO1mT_0GMioffA@mail.gmail.com>

Op 18-05-21 om 20:08 schreef Bart Schaefer:
> On Tue, May 18, 2021 at 10:37 AM Martijn Dekker <martijn@inlv.org> wrote:
>>
>> Op 18-05-21 om 01:15 schreef Bart Schaefer:
>>> Aside, it's a bit odd that SHLVL isn't read-only.
>>
>> SHLVL is increased even when you do something like 'exec zsh'
> 
> Actually no, it isn't.
> 
> % echo $SHLVL && exec Src/zsh -fc 'echo $SHLVL'
> 2
> 2

I see.

Or, actually, zsh does increase it, but also decreases it when doing an 
'exec'. Not all shells do the latter. What I got from ksh93 was:

$ ksh
$ echo $SHLVL
2
$ exec zsh -fc 'echo $SHLVL'
3

Since I now maintain a ksh93 fork, maybe I should fix its 'exec' to act 
like zsh. It seems like the sensible thing to do.

-- 
||	modernish -- harness the shell
||	https://github.com/modernish/modernish
||
||	KornShell lives!
||	https://github.com/ksh93/ksh


  reply	other threads:[~2021-05-18 19:41 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-16 15:24 Vincent Lefevre
2021-05-16 18:37 ` Bart Schaefer
2021-05-17 20:26   ` Vincent Lefevre
2021-05-17 21:00     ` Bart Schaefer
2021-05-17 22:27       ` Phil Pennock
2021-05-17 23:15         ` Bart Schaefer
2021-05-18  0:30           ` Phil Pennock
2021-05-18  1:14             ` Bart Schaefer
2021-05-18  8:28             ` Vincent Lefevre
2021-05-18  8:15           ` Vincent Lefevre
2021-05-18 14:53             ` Bart Schaefer
2021-05-19  4:25               ` Bart Schaefer
2021-07-18 23:10                 ` Lawrence Velázquez
2021-05-18 15:18           ` Mikael Magnusson
2021-05-18 16:14             ` Peter Stephenson
2021-05-18 18:20               ` Bart Schaefer
2021-05-18 17:37           ` Martijn Dekker
2021-05-18 18:08             ` Bart Schaefer
2021-05-18 19:40               ` Martijn Dekker [this message]
2021-05-18 18:06           ` Stephane Chazelas
2021-05-18 18:12             ` Bart Schaefer
2021-05-18 18:50               ` $SHLVL origin (was: $PPID not updated when the PPID changes (parent killed)) Stephane Chazelas
2021-05-18 15:56         ` $PPID not updated when the PPID changes (parent killed) Stephane Chazelas

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