Learn Linux Shell Scripting - Fundamentals of Bash 4.4

usermod

Description	Modify a user account.
Syntax	usermod [options] LOGIN
Practical uses	usermod -g <group> <user>: Change the primary group of the <user> to <group>. usermod -aG <group> <user>: Add the <user> to the <group>. For the user, this will be a supplementary group. usermod -s <shell> <user>: Set the login shell for the <user>. usermod -md <homedir> <user>: Move the <user>s home directory to <homedir>.