Which run level is designated for rebooting the system?

Run level 6 is designated for rebooting the system in Linux. In traditional Unix and Linux systems, run levels are used to define the state of the machine. Each run level corresponds to a different mode of operation.

Run level 6 specifically instructs the system to reboot. When a system is set to run level 6, it will shut down all processes, unmount file systems, and then restart the system. This is a controlled way to reboot the machine, ensuring that all applications and services are properly closed, which helps to prevent data loss and corruption.

Other run levels have different purposes: for example, run level 0 is for shutting down the system, while run levels 3 and 5 are associated with multi-user modes, with run level 5 typically including a graphical user interface. Each of these run levels serves a distinct role in managing the operational state of a Linux system, but only run level 6 is specifically designed for rebooting.