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Asked: 2026-05-24T20:14:33+00:00

I have several users say: A,B,C,D, etc. and 2 group: master, slave. Each user

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I have several users say: A,B,C,D, etc. and 2 group: master, slave.
Each user belongs to only one of these groups (exclusively).
How can I programmatically change this belonging?

For example: user A belongs to group “master”
How to remove it from group “master” and add it to group “slave”?

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1 Answer

  1. Editorial Team

    From the man page of usermod:

    -G, --groups group,...
With this option a list of supplementary groups can be specified, which the user should become a member of. Each group is separated from the next one only by a comma, without whitespace. The user is removed from all other groups not specified.


-R, --remove-from-group group,...
With this option a list of groups can be specified, from which the user should be removed. Each group is separated from the next one only by a comma, without whitespace.

    If for some reason this isn’t pre-installed on your system it is a command from the pwdutils package.

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