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:
[EMAIL PROTECTED]:~$ id `ps -up 2551|tail -n1|awk '{print $1}'`
uid=30270(ams) gid=134(update) groups=134(update)
Replace 2551 with your process.
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