What command displays the current runlevel of a Linux system

What command displays the current runlevel of a linux system - CompTIA Linux + XK0-005

Question

What command displays the current runlevel of a Linux system?

Answers

uptime
level
who
correct

runlevel

Explanation

Correct Answer: d. runlevel

The runlevel command displays the current and previous runlevels of a Linux system. Runlevels define the state of the machine, such as whether it's in single-user mode, multi-user mode, or graphical mode.

When you run the runlevel command, it returns two characters: the previous runlevel and the current one. This command is particularly useful for administrators managing system states or troubleshooting boot-level configurations.

Why the other options are incorrect :

a. uptime: This command shows how long the system has been running, including the current time, number of users, and system load averages. It does not display information about runlevels or system states, so it's unrelated to the question's goal.
b. level: This is not a valid Linux command to retrieve runlevel information. Typing level would result in a “command not found” error unless it’s an alias or script defined by the user, which is not standard.
c. who: The who command shows who is logged into the system and their session details. It may include system boot time but does not show the current runlevel directly.