How to Add Users to Groups in Ubuntu Linux

Add a user to a group in Ubuntu Linux

To add a user to a group in Ubuntu Linux, use the terminal command sudo usermod -a -G groupname username. This adds the user account to a secondary group without removing them from their current groups, letting them share file permissions and run restricted commands right away.

Here’s the format for adding a user to a group in Ubuntu Linux.

sudo usermod -a -G groupname username

Add a user to multiple groups.

sudo usermod -a -G group1,group2 username

The commands covered so far assume the groups already exist.

Terminal commands accomplish this group membership update in Ubuntu Linux. For example, executing sudo usermod -aG sudo geekrewind adds the user geekrewind to the sudo group. This grants geekrewind the permissions of the sudo group, allowing them to run commands with administrator privileges.

sudo usermod -a -G sudo geekrewind

Always include the -a flag so the system appends the user to the new group instead of overwriting their existing memberships. Watch out for typos here, because targeting a missing group causes the tool to throw an error.

Change a user's primary group in Ubuntu Linux

To change a user's primary group in Ubuntu Linux, run the terminal command sudo usermod -g groupname username. This updates the main group attached to the user account so that any new files and folders you create automatically belong to the new group instead of the old one.

Primary group modifications in Ubuntu Linux rely on the usermod command paired with the -g option.

sudo usermod -g groupname username

For example, the commands below change the primary group of the user geekrewind to developers.

sudo usermod -g developers geekrewind

Account creation allows defining primary and secondary groups simultaneously. Setting up a new geekrewind account with a primary group of users and secondary groups of wheel and developers uses this structure:

sudo useradd -g users -G wheel,developers geekrewind

Instructions for listing all groups in Ubuntu Linux live in the related post below.

How to list groups in Ubuntu Linux

Proper group management keeps multi-user systems secure and organized.

Conclusion:

• Adding users to groups in Ubuntu Linux is essential for organizing and administering user accounts.
• Administrators can effectively manage resource access and permissions by understanding the distinction between primary and secondary groups.
• The steps outlined provide clear guidance on adding users to single and multiple groups and changing a user's primary group.
• Readers can refer to the provided link for instructions on listing all groups in Ubuntu Linux, enhancing their understanding of user and group management.