Linux and Unix halt, poweroff and reboot
Stop the computer.
halt [-l] [-n] [-q] [-y]
halt [-n] [-w] [-d] [-f] [-i] [-p] [-h]
reboot [-n] [-w] [-d] [-f] [-i]
poweroff [-n] [-w] [-d] [-f] [-i] [-h]
|-d||Don't write the wtmp record. The -n flag implies -d.|
|-h||Put all harddrives on the system in standby mode just before halt or poweroff.|
|-i||Shut down all network interfaces just before halt or reboot.|
|-l||Suppress sending a message to the system log daemon, syslogd, about who executed halt .|
|-n||Prevent the sync before reboot or halt.|
|-p||When halting the system, do a poweroff. This is the default when halt is called as poweroff.|
|-q||Quick halt. No graceful shutdown is attempted.|
|-r||Force halt or reboot, don't call shutdown.|
|-y||Halt the system, even from a dialup terminal.|
|-w||Don't actually reboot or halt but only write the wtmp record (in the /var/log/wtmp file).|
Set the computer to a mode that enables a user to turn off the computer.
Stop the processor (if you have proper permission).