Special runlevels in Linux

Special runlevels "s", "emergency", "init=/bin/sh" and single user mode (runlevel 1)

  • Runlevel "1" — will run /etc/rc.d/rc1.d
  • Runlevel "s" — do not need /etc/inittab and will open root shell on /dev/console
  • Runlevel "emergency" — boot single user mode without startup scripts, root filesystem will be mount in read only mode.
  • Runlevel "init=/bin/sh" — run /bin/sh instead of /sbin/init

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