You can check user groups in Linux with commands like groups, id, getent, and /etc/group to manage permissions easily.

Linux is a multi-user environment, which means more than one user can use the system at one time. Granted, that mostly takes the form of console access (via SSH), because you can't easily have two ...

Many Linux commands can do more than you might think. The usermod command is one such command, and it can be very handy.