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Re: cd with empty argument does not conform to POSIX.1-2024 (Was: inherit OLDPWD from environment variable)

X-seq: zsh-workers 53004
From: Lawrence Velázquez <larryv@xxxxxxx>
To: zsh-workers@xxxxxxx
Subject: Re: cd with empty argument does not conform to POSIX.1-2024 (Was: inherit OLDPWD from environment variable)
Date: Tue, 23 Jul 2024 17:09:27 -0400
Archived-at: <https://zsh.org/workers/53004>
Feedback-id: iaa214773:Fastmail
In-reply-to: <CAA=-s3xyZpiSXQz-pK1aVXVK6T00=8UOb1O_XdqUVGnVZHRMrQ@mail.gmail.com>
List-id: <zsh-workers.zsh.org>
References: <ffccf642-e5bc-4e22-9bb9-4ba3c20ccf1e@app.fastmail.com> <CAA=-s3xyZpiSXQz-pK1aVXVK6T00=8UOb1O_XdqUVGnVZHRMrQ@mail.gmail.com>

On Tue, Jul 23, 2024, at 11:47 AM, Mark J. Reed wrote:
>> The current behavior is to do nothing and exit with a zero status.
>
> For comparison purposes, note that this is also the current behavior of 
> bash, even in POSIX mode.

This will be fixed in the next release; the development version [*]
already errors out:

	% ./bash -c 'echo "$BASH_VERSION"; cd ""'
	5.3.0(6)-alpha
	./bash: line 1: cd: null directory

[*]: https://git.savannah.gnu.org/cgit/bash.git/tree/builtins/cd.def?h=devel&id=6c703092759ace29263ea96374e18412c59acc7f#n333

> Also dash.

Presumably a future release will fix this, given dash's explicit
goal of POSIX conformance.

> Whereas ksh does report an error  ("bad directory") and exit
> with status 1.

This bolsters the argument for, at a minimum, updating ksh/sh
emulation via POSIX_CD, as does the fact that the Solaris 10
Bourne shell fails too.

-- 
vq

References:
- cd with empty argument does not conform to POSIX.1-2024 (Was: inherit OLDPWD from environment variable)
  - From: Lawrence Velázquez
- Re: cd with empty argument does not conform to POSIX.1-2024 (Was: inherit OLDPWD from environment variable)
  - From: Mark J. Reed

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