What is run level?
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What is run level?
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A run level is a state of a Linux system, which defines which system services are operating. Following are some of the important run levels used by a Linux system:
| 0 | All processes are terminated and the computer comes to a halt. |
| 1 | This run level switches the system to a single-user mode. It is frequently used for system maintenance. |
| 2 | This run level is used for multiuser mode. |
| 3, 4 | These run levels are used for multiuser mode with network services. |
| 5 | This run level is used for multiuser mode with network services and presents a graphical user interface. |
The run levels are configured in the /etc/inittab file.
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