Creating a group and becoming a member without logout/login

Yesterday, I started playing with an USB-to-serial adapter. As it turned out, my user was not allowed to access /dev/ttyUSB0, because the user was not part of the uucp group. Adding a user to a group is easy on Arch/Manjaro:

$ gpasswd -a [user] [group]
or in my case:
$ gpasswd -a jans uucp

But to become a member of the group without having to logout and login a neat utility exists. Say hello to `newgrp`.

$ groups
sys network power docker lp wheel jans
$ newgrp uucp
$ groups
uucp sys network power docker lp wheel jans

Never heard of this tool, but changing group memberships is not what I tend to do once my system is configured. See man newgrp(1) for details.

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