Today's commands are how you can check what runlevel your system is in and then change it.
Check the current runlevel:
tmp]# runlevel N 5 Change the current runlevel:
tmp]# init <new_level> The run levels in Unix/Linux are used to define what state init (the parent of all processes) is in. Each distribution of Unix/Linux has different definitions of what run levels starts what processes.
Usually you can find the different definitions in /etc/inittab below is the one from a fedora box.