======Runlevel======

====Overview====
(from wikipedia)

the term **runlevel** refers to the mode of operation in an OS that implements the Unix System V-style initialization. 

runlevel defines the state of the machine after boot. Different runlevels are typically assinged to the:

   * single-user mode (root)
   * multi-user mode without networking services started
   * multi-user mode with networking services started
   * system shutdown
   * system reboot

The real thing you should know about this: the **Linux Standard Base specification**.

This is a general guide for what the run level ID's pair up too. In debian 2-5 are the same (full multi-user with console logins), RHEL is more secured but also a pain in the ass. 

<code>
0       Halt
1       Single-User mode
2       Multi-user mode (sin networking)
3       Multi-user mode (with networking)
4       Not generally used
5       Multi-user mode (with x & console)
6       Reboot

</code>

So by editing /etc/inittab , you could in theory have a program enter runlevel 6 and reboot the system. >;]~