SysV Runlevels

• Runlevel 0
• Halt (Shutdown)
• Runlevel S
• Single user mode on boot
• Runlevel 1
• Single user mode on switch from multi-user mode
• Runlevel 2-5
• Multi user mode, typically all the same
• Runlevel 6
• Reboot
• Runlevel 7-9
• Not used