Re^2: Fetching groups a user is in

I saved the code as gpu.pl and ran it for some users:

$ gpu.pl root
0
2
3
4
5
20
31
0

$ gpu.pl rvtol

$ id -Gn rvtol
user
[download]

With root, group 0 is reported twice. With rvtol, group user (30) isn't reported.

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Regards, Ruud