bash newgrp(1) -c option? Fwd: /usr/bin/sg in Cygwin?

[Cedric Blancher]

Chet,

The Solaris ksh93-integration version of ksh93 has a newgrp -c option
(David Korn, Glenn Fowler and Roland Mainz did implement it), which
works like ksh93/bash -c, and executes script under the requested
group, and upon exiting resumes the old shell with the old group.

Could you please implement this (newgrp -c 'command') in the bash
newgrp builtin too?

Ced

---------- Forwarded message ---------
From: Dan Shelton via Cygwin <cygwin@cygwin.com>
Date: Mon, 22 Apr 2024 at 01:20
Subject: Re: /usr/bin/sg in Cygwin?
To: <cygwin@cygwin.com>


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.
>
> 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.

Dan
--
Dan Shelton - Cluster Specialist Win/Lin/Bsd

--
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple


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