Re: how to list supplementary groups?

[Alfred M\. Szmidt]

   So how can I find the supplementary groups of process 4321 using id
   or groups?  It does't seem to be possible.

You'd need to hack a bit for that to work.  Something like I dunno:

address@hidden:~$ id `ps -up 2551|tail -n1|awk '{print $1}'`
uid=30270(ams) gid=134(update) groups=134(update)

Replace 2551 with your process.