FreeBSD Manual Pages
- binuptime(9), getbinuptime(9), microuptime(9), getmicrouptime(9), nanouptime(9), getnanouptime(9), sbinuptime(9), getsbinuptime(9)
- get the time elapsed since boot
- boottime(9), time_second(9), time_uptime(9)
- system time variables
- ruptime(1)
- show host status of local machines
- uptime(1)
- show how long system has been running
- guptime(1), uptime(1)
- tell how long the system has been running