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Date: Mon, 22 Apr 2024 10:46:48 +0200
To: cygwin AT cygwin DOT com
Subject: Re: /usr/bin/sg in Cygwin?
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From: Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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Cc: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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On Apr 21 21:35, Eliot Moss via Cygwin wrote:
> 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

WJFFM:

  $ id
  uid=1049577(corinna) gid=1049701(vinschen) groups=1049701(vinschen),545(Users),14(REMOTE INTERACTIVE LOGON),4(INTERACTIVE),11(Authenticated Users),15(This Organization),4095(CurrentSession),66048(LOCAL),1049089(Domain Users),70145(Authentication authority asserted identity),1049148(Denied RODC Password Replication Group),401408(Medium Mandatory Level)
  $ newgrp Users id -g
  545


Corinna

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