This is really a basic question but on my system the binary 'usermod' is missing which implies it is not part of the distribution files. What I have there is addgroup, delgroup, adduser & deluser but I didn't find a tool to manipulate group membership for existing users.
Even though I know how to do it, editing /etc/passwd and etc/group is not my favorite way of acomplishing this fairly basic objective. Is there another tool -using the GUI- which is intended for this purpose? In that case it is well hidden. Or did no one ever feel the need to do anything beyond creating a default user? ;-)
Thanx for enlightening me.
/emgi