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Runlevel

Similar to how Microsoft Windows has “safe” and “command prompt only” modes you can boot the operating system into, the Linux operating system has different modes of operation — or “runlevels” — it may run in. Unlike Windows, however, you can change Linux runlevels on the fly.

When you boot a computer running Linux, it will boot into a default runlevel (this is usually level 3 or level 5). There are six different runlevels most Linux distributions use (with System V init - like Red Hat, or Mandrake)

  • 0 - Halt the system
  • 1 - Single-user mode
  • 2 - Multi-user mode (without NFS)
  • 3 - Multi-user mode
  • 5 - Multi-user mode, graphical login
  • 6 - Reboot the system
 

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