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Linux Foundation Certified System Administrator · Linux Foundation
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Option A. shutdown -r now and Option C. telinit 6 reboot the system when using SysV init. Option A: The shutdown -r now command reboots the system when using SysV init. It sends a signal to init to switch to runlevel 6, which is the runlevel used to reboot the system. Option B: The shutdown -r "rebooting" command does not reboot the system. The -r option tells shutdown to reboot the system, but the command must also specify a time at which the reboot should occur. Option C: The telinit 6 command tells init to switch to runlevel 6, which is the runlevel used to reboot the system when using SysV init. Option D: The telinit 0 command tells init to switch to runlevel 0, which is the runlevel used to halt the system. It does not reboot the system. Option E: The shutdown -k now "rebooting" command does not reboot the system. The -k option tells shutdown to send a warning message to all logged-in users, but it does not initiate a reboot.