Use "sudo usermod -a -G example_group example_user" to add a user to a group. To add a user to multiple groups at once, separate groups by commas, like "sudo usermod -a -G group1,group2,group3 example ...

The usermod command is a tool for updating details about an existing user account in your system. It's kind of like editing the "profile" of a Linux user. With it, you can adjust anything from the ...