DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 2414B3858D1E
Message-ID: <c772b67d-be50-5b75-1b2b-99d9f1c5a717@cs.umass.edu>
Date: Sun, 21 Apr 2024 21:35:04 -0400
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101
 Thunderbird/102.15.1
Subject: Re: /usr/bin/sg in Cygwin?
Content-Language: en-US
To: Dan Shelton <dan.f.shelton@gmail.com>, cygwin@cygwin.com
References: <CAAvCNcBw0z3EJnjvs4hooW7cmgRvCA=-ofMywYZM3+f9OcJEFQ@mail.gmail.com>
 <CAAvCNcDch6VYDYR3ocwUdko8m0CUtMCM-OLRqmDDn-8hCQYySg@mail.gmail.com>
 <b7ee5e6a-f351-4293-861a-9c4b59ef69dd@SystematicSW.ab.ca>
 <CAAvCNcB_vuStJjnd+GohVM-y=AHZBUP=Gi5A+AAgnddP3wDdQQ@mail.gmail.com>
In-Reply-To: <CAAvCNcB_vuStJjnd+GohVM-y=AHZBUP=Gi5A+AAgnddP3wDdQQ@mail.gmail.com>
From: Eliot Moss via Cygwin <cygwin@cygwin.com>
Reply-To: Eliot Moss <moss@cs.umass.edu>
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="us-ascii"; Format="flowed"
Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie.com@cygwin.com>

On 4/21/2024 7:20 PM, Dan Shelton via Cygwin wrote:
> 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.

??

The man pages has:

  newgrp [-] [group] [command [args...]]

which implies to me that you can give a command.

Did that not work for you?  EM

-- 
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