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Date:	Mon, 22 Apr 2024 07:55:00 +0200
Message-ID:	<CALXu0Uen=vmJ5a8bv7ikOfHf_me0+uPkfcUHSPvugBMj_Vg_SA@mail.gmail.com>
Subject:	Re: /usr/bin/sg in Cygwin?
To:	cygwin AT cygwin DOT com
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From:	Cedric Blancher via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Cedric Blancher <cedric DOT blancher AT gmail DOT com>
Sender:	"Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

On Mon, 22 Apr 2024 at 01:20, Dan Shelton via Cygwin <cygwin AT cygwin DOT com> wrote:
>
> On Sat, 20 Apr 2024 at 07:39, Brian Inglis via Cygwin <cygwin AT cygwin DOT 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.
> >
> > To see possibly relevant commands, run:
> >
> > $ apropos -s 1,1p group
> > chgrp (1)            - change group ownership
> > chgrp (1p)           - change the file group ownership
> > chown (1)            - change file owner and group
> > g3topbm (1)          - convert a Group 3 fax file into a PBM image
> > groups (1)           - print the groups a user is in
> > id (1)               - print real and effective user and group IDs
> > make (1)             - GNU Make utility to maintain groups of programs
> > make (1p)            - maintain, update, and regenerate groups of programs
> > mkgroup (1)          - Write /etc/group-like output to stdout
> > newgrp (1)           - change primary group for a command
> > newgrp (1p)          - change to a new group
> > pbmtog3 (1)          - convert a PBM image into a Group 3 MH fax file
>
> newgrp(1) is USELESS. It only opens an interactive shell, but does not
> allow the user to execute a non-interactive script with the requested
> group like bash -c does.

Linux /usr/bin/sg source is in
https://github.com/shadow-maint/shadow/blob/master/src/newgrp.c
So this is just a packaging issue that whoever does the Cygwin newgrp
package has to package /usr/bin/sg too

Ced
-- 
Cedric Blancher <cedric DOT blancher AT gmail DOT com>
[https://plus.google.com/u/0/+CedricBlancher/]
Institute Pasteur

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