```$ time facter system_profiler.serial_number
C02...
# generala
allister
08/16/2017, 2:25 PM Copy code
$ time facter system_profiler.serial_number
C02*********
real 0m0.586sallister
08/16/2017, 2:25 PM$ time facter system_profiler.serial_number
C02*********
real 0m0.586s