Usermod

usermod command included in passwd package: https://linux.die.net/man/8/usermod

Add an additional secondary group:

• sudo usermod -aG sudo YOUR_USERNAME
• usermod -a -G YOUR_GROUP YOUR_USERNAME

Change primary group for user:

usermod -g yournewprimarygroupname yourusername

usermod -s /usr/sbin/nologin myuser
ssh and scp will fail

• groups
• groups USERNAME

You may need to start a new login shell after adding user: su - USERNAME

sudo usermod -l newusername oldusername change user name

Related commands

• passwd
• groups
• Passwordless sudo
• visudo, sudoers
• macOS: sudo dseditgroup -o edit -a $username_to_add -t user admin

See also

• sudo, id, visudo, useradd, userdel, usermod, groups, passwd, chown, chmod, chgrp, groupadd, groupdel, Passwordless sudo, passwd (package), sudo --help