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You can change the 3 to a 5 to change your default runlevel from the command line interface (3) to the graphical login (5). Change only this number and nothing else. id:5:initdefault:
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TIP If your /etc/inittab file becomes corrupted, you can reboot and enter linux single at the boot prompt to start up your system, bypassing the inittab file. You can then edit the file to fix it.
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No matter what runlevel you start in, you can change from one runlevel to another with the telinit command. If your default runlevel is 3, you power up in runlevel 3, but you can change to, say, runlevel 5 with telinit 5. The command telinit 0 shuts down your system. In the next example, the telinit command changes to runlevel 1, the administrative state: # telinit 1 telinit is really a symbolic link (another name for a command) to the init command. The init command performs the actual startup operations and is automatically invoked when your system starts up. Though you could use init to change runlevels, it is best to use telinit. When invoked as telinit, init merely changes runlevels.
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Use the runlevel command to see what state you are currently running in. It lists the previous state followed by the current one. If you have not changed states, the previous state will be listed as N, indicating no previous state. This is the case for the state you boot up in. In the next example, the system is running in state 3, with no previous state change. # runlevel N 3
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Although you can power down the system with the telinit command and the 0 state, you can also use the shutdown command. The shutdown command has a time argument that gives users on the system a warning before you power down. You can specify an exact time to shut down, or a period of minutes from the current time. The exact time is specified by hh:mm for the hour and minutes. The period of time is indicated by a + and the number of minutes. The shutdown command takes several options with which you can specify how you want your system shut down. The -h option, which stands for halt, simply shuts down the system, whereas the -r option shuts down the system and then reboots it. In the next example, the system is shut down after ten minutes. # shutdown -h +10 To shut down the system immediately, you can use +0 or the word now. The following example shuts down the system immediately, and then reboots. # shutdown -r now With the shutdown command, you can include a warning message to be sent to all users currently logged in, giving them time to finish what they are doing before you shut them down. # shutdown -h +5 "System needs a rest" If you do not specify either the -h or the -r options, the shutdown command shuts down the multiuser mode and shifts you to an administrative single-user mode. In effect, your system state changes from 3 (multiuser state) to 1 (administrative single-user state). Only the root user is active, allowing the root user to perform any necessary system administrative operations with which other users might interfere.
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TIP You can also shut down your system from the Gnome or KDE desktops.
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The shutdown options are listed in Table 1-4.
Command
Description
shutdown [-rkhncft] Shuts the system down after the time [warning-message] specified time period, issuing warnings to users; you can specify a warning message of your own after the time argument; if neither -h nor -r is specified to shut down the system, the system sets to the administrative mode, runlevel state 1.
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