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Date: Mon, 22 Apr 2024 11:40:39 -0600
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Subject: Re: /usr/bin/sg in Cygwin?
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From: Brian Inglis via Cygwin <cygwin@cygwin.com>
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Cc: Brian Inglis <Brian.Inglis@SystematicSW.ab.ca>
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On 2024-04-21 23:35, Cedric Blancher via Cygwin wrote:
> Good morning!
> 
> On Sat, 20 Apr 2024 at 07:39, Brian Inglis via Cygwin <cygwin@cygwin.com> wrote:
>>
>> On 2024-04-19 17:47, Dan Shelton via Cygwin wrote:
>>> On Fri, 23 Feb 2024 at 22:25, Dan Shelton wrote:
>>>> Is there a package which provides /usr/bin/sg (execute shell commands
>>>> in a different group)?
>>
>> The POSIX standard command is newgrp - install cygwin-doc to see Cygwin (and
>> newlib libc) man pages (and info, html, PDF docs), man-pages-posix to see POSIX
>> man pages, and man-pages-linux if you want to see recent Linux release man pages.
> 
> Debian /usr/bin/sg (setgid analog to /usr/bin/su) comes from the
> package "login" (https://packages.debian.org/bookworm/login), same
> package as /usr/bin/newgrp. So maybe it just needs to be packaged by
> whoever owns the Cygwin package for /usr/bin/newgrp?

The Linux package is all about PAM hooks and other Linux stuff.

As with BSD, login authentication is delegated to the underlying OS, in this 
case MS Windows, so any such utilities have to be rewritten, using the 
underlying emulation or OS access layers, or additions to them.
-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer     but when there is no more to cut
                                 -- Antoine de Saint-Exupéry


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