command init seems to be the first process running after each booting. If I init in my Ubuntu Gnome terminal, will that restart my OS?
What will happen if I run the command init in my Ubuntu Gnome terminal?
init
If you're not root (and you shouldn't normally be logging in as root), you'll just get a message:bash$ initinit: Need to be rootif you are root, you can change the current run level of the system using init (it actually runs telinit to make the change).bash$ sudo initinit: missing runlevelTry `init --help' for more information.if you really want to reboot your system, you can do it by telling init to switch to run level six:bash$ sudo init 6(I'm not actually going to do this because I don't want to really reboot my machine.)For future reference, all of this stuff is well described in the man pages.  Try running man init for example.  Other interesting man pages include runlevel and telinit.