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173.

This command is intended to instruct the kernel to reboot or halt the system; when run without the -f option it will actually execute /sbin/shutdown.

Before the system is rebooted or halted, the disks are syncd; this can be avoided by giving -n.

Network interfaces can be brought down by giving the -i option, and IDE disks can be put into standby by giving the -h option. On Linux, these are almost never necessary as the kernel shuts down all devices anyway.