• SVR4 has runlevels, BSD does not
• Redhat/CentOS/Fedora/Mandriva runlevels:
  • 0: system halted
  • 1: single-user/maintenance mode
  • 2: multi-user, NFS deactivated, text login
  • 3: multi-user, NFS activated, text login
  • 4: unused/site-defined
  • 5: multi-user, graphical (e.g. xdm) login
  • 6: reboot
• different distributions may be slightly different: SuSE
• runlevel command tells you what runlevel you're at.
• init X will instruct init to take the system to runlevel X
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