Add a User to a Group (or Second Group) on Linux | Ubuntu

Add a New Group

If you want to create a new group on your system, use the groupadd command following command, replacing new_group with the name of the group you want to create:

# sudo groupadd new_group

Add an Existing User Account to a Group

To add an existing user account to a group on your system, use the usermod command, replacing examplegroup with the name of the group you want to add the user to andexampleusername  with the name of the user you want to add.

# usermod -aG examplegroup exampleusername

For example, to add the user geek to the group sudo , use the following command:

# usermod -aG sudo adi

To view the groups another user account is assigned to, run the groups command and specfy the name of the user account.

# groups exampleusername

Add a User to Multiple Groups

While assigning the secondary groups to a user account, you can easily assign multiple groups at once by separating the list with a comma.

# usermod -a -G group1,group2,group3 exampleusername

For example, to add the user named geek to the ftp, sudo, and example groups, you’d run:

# usermod -a -G ftp,sudo,example adi