# oslevel
5.3.0.0
# man reboot
Description
The reboot command can be used to perform a reboot operation if no other
users are logged into the system. The shutdown command is used when the
system is running and multiple users are logged into the system. Both
commands write an entry to the error log that states that the system was
deliberately temporarily disabled.
说的很明了了,reboot在当用户模式下是执行重启操作,但是在多用户情况下执行的是关机操作,坑爹了,呵呵。