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Date: Sun, 21 Apr 2024 21:35:04 -0400
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Subject: Re: /usr/bin/sg in Cygwin?
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To: Dan Shelton <dan DOT f DOT shelton AT gmail DOT com>, cygwin AT cygwin DOT com
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From: Eliot Moss via Cygwin <cygwin AT cygwin DOT com>
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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 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.

??

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

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