/proc/uptime in Mac OS X

Question

I need the EXACT same output as Linux\'s \"cat /proc/uptime\".

For example, with /proc/uptime, you\'d get

1884371.64 38646169.12

Answer 1

boottime=`sysctl -n kern.boottime | awk '{print $4}' | sed 's/,//g'`
unixtime=`date +%s`
timeAgo=$(($unixtime - $boottime))
uptime=`awk -v time=$timeAgo 'BEGIN { seconds = time % 60; minutes = int(time / 60 % 60); hours = int(time / 60 / 60 % 24); days = int(time / 60 / 60 / 24); printf("%.0f days, %.0f hours, %.0f minutes, %.0f seconds", days, hours, minutes, seconds); exit }'`
echo $uptime

Will return something like 1 Day, 20 hours, 10 minutes, 55 seconds