Linux and Unix halt, poweroff and reboot
Stop, power down, or reboot the system.
reboot [OPTION]... [REBOOTCOMMAND]
These programs allow a system administrator to reboot, halt or poweroff the system.
When called with --force or when in runlevel 0 or 6, this tool invokes the reboot system call itself (with REBOOTCOMMAND argument passed) and directly reboots the system. Otherwise this simply invokes the shutdown tool with the appropriate arguments without passing REBOOTCOMMAND argument.
Before invoking reboot, a shutdown time record is first written to /var/log/wtmp
|-f, --force||Does not invoke shutdown and instead performs the actual action you would expect from the name.|
|-p, --poweroff||Instructs the halt command to instead behave as poweroff.|
|-w, --wtmp-only||Does not call shutdown or the reboot system call and instead only writes the shutdown record to /var/log/wtmp.|
|--verbose||Outputs slightly more verbose messages when rebooting, which can be useful for debugging problems with shutdown.|
|RUNLEVEL||reboot will read the current runlevel from this environment variable if set in preference to reading from /var/run/utmp.|
|/var/run/utmp||File where the current runlevel will be read from; this file will also be updated with the runlevel record being replaced by a shutdown time record.|
|/var/log/wtmp||A new runlevel record for the shutdown time will be appended to this file.|
Set the computer to a mode that enables a user to safely power off the system.
Power off the system.
Reboot the system.