I need the EXACT same output as Linux\'s \"cat /proc/uptime\".
For example, with /proc/uptime, you\'d get
1884371.64 38646169.12
Here is what I Do to get the the values instead of Cut method
sysctl kern.boottime | awk '{print $5}'
Where $5 is the Range of the string
Example
$1 Gives you "sysctl kern.boottime"
$2 Gives you "{"
$3 Gives you "sec"
from the String
kern.boottime: { sec = 1604030189, usec = 263821 } Fri Oct 30 09:26:29 2020