TestOut Linux Pro 2025 – 400 Free Practice Questions to Pass the Exam

The command used to switch to the root user in a Linux environment is represented by the first choice, which is "su -". This command stands for "substitute user" and allows a user to assume the identity of another user, with the dash indicating that the user will also inherit the environment of the root user. By executing "su -" without a username, the command defaults to switching to the root user.

When using this command, the user will be prompted to enter the root password, and upon successful authentication, they will have root privileges, which include the ability to execute any commands that require administrative access on the system. This is crucial for performing system maintenance, managing users, or modifying system configurations.

The other options do not represent the standard commands used for switching to the root user. "sudo su" can also switch to the root user with the appropriate permissions, but "su -" is more directly associated with logging in as root specifically. "root" and "admin" are not commands but rather usernames or titles, making them invalid in this context. Therefore, "su -" is the ideal choice for switching to the root user in Linux.