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How do I find previous runlevels?
In case of Linux systems using SysV init (RHEL/CentOS 6 and earlier releases), the command ‘runlevel’ will print previous and the current run level. The ‘who -r’ command can also be used to print the current run level. This command will display the current target for the system.
How do I find my default runlevel Ubuntu?
To change the default runlevel, use your favorite text editor on /etc/init/rc-sysinit. conf... Change this line to whichever runlevel you want… Then, at each boot, upstart will use that runlevel.