The shutdown command in Linux safely powers off or reboots a system, allowing users and administrators to schedule the shutdown after a certain time interval or at a specific time.

It ensures the system terminates all processes correctly and prevents data corruption.

The command accepts various parameters to specify time and behavior, with the option -c used to cancel a scheduled shutdown.

In the provided terminal screenshot, the user first runs the command sudo shutdown +4, which schedules the system to shut down after 4 minutes.

After correctly authenticating with their password, the terminal confirms the shutdown has been scheduled, displaying the precise shutdown time.

Immediately afterward, the user issues the shutdown -c command, canceling the previously scheduled shutdown operation and restoring the system to normal operation.

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