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E.9. Changing Runlevels at Boot Time

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Under Red Hat Enterprise Linux, it is possible to change the default runlevel at boot time.
To change the runlevel of a single boot session, use the following instructions:
  • When the GRUB menu bypass screen appears at boot time, press any key to enter the GRUB menu (within the first three seconds).
  • Press the a key to append to the kernel command.
  • Add <space><runlevel> at the end of the boot options line to boot to the desired runlevel. For example, the following entry would initiate a boot process into runlevel 3:
    grub append> ro root=/dev/VolGroup00/LogVol00 rhgb quiet 3
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