RUNLEVELS: It is nothing but a mode of operation in Linux OS.
- A runlevel is a software configuration of the system which allows only a selected group of processes to exist.
- The processes spawned by init for each of these runlevels are defined in the /etc/inittab file.
- Init can be in one of eight runlevels: 0-6 and S or s. The runlevel is changed by a privileged user running telinit command, which sends appropriate signals to init, telling it which runlevel to change to.
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