uptime

Command	Explanation	Example
uptime	Shows the time the system has been up and the system load averages the last 1, 5 and 15 minutes	23:10:18 up 5:12, 1 user, load average: 0.27, 0.40, 0.35
uptime --pretty	Shows the uptime in a pretty format without load averages	up 5 hours, 12 minutes
uptime --since	Shows the uptime in full date format without load averages	2018-12-15 17:58:14
cat /proc/uptime	Time in seconds since boot. First number: The number of seconds the system has been up. Second number: The total system idle time, in seconds. On multi core systems the second number is the sum of the idle time of each CPU or thread. So a dual core with to threads per core counts for 4 cores	cat /proc/uptime gives 18884.21 222468.89 on a 6 core systems with two treads per core. 222468/12=18539 is the idle time per thread. Which tells us that the system has been idle most of the time
Boot time in epoch	Calculate the boot time in epoch	See “Calculate boottime in epoch” below
last -F reboot	Show the uptimes since ?

Calculate boottime in epoch

daynowepoch=`date +%s`
uptimeepoch=`cat /proc/uptime | cut -d " " -f 1 | cut -d "." -f 1`
boottimeepoch=$(( $daynowepoch - $uptimeepoch ))
echo Boottime in epoch is $boottimeepoch

Output examples

The first character in all examples is a space

 14:30:01 up 0 min,  1 user,  load average: 1,14, 0,27, 0,09
 12:00:01 up 2 min,  1 user,  load average: 0,58, 0,60, 0,26
 11:35:01 up 14 min,  1 user,  load average: 0,10, 0,18, 0,17
 13:00:01 up  1:02,  1 user,  load average: 0,08, 0,10, 0,09
 22:55:01 up 11:34,  7 users,  load average: 0,27, 0,25, 0,19
 00:30:01 up 1 day, 3 min,  7 users,  load average: 0,32, 0,24, 0,19
 00:40:01 up 1 day, 13 min,  7 users,  load average: 0,02, 0,12, 0,15
 15:35:01 up 1 day,  7:52,  0 users,  load average: 0,00, 0,01, 0,00
 08:30:01 up 1 day, 20:26,  7 users,  load average: 0,76, 0,72, 0,37
 07:50:01 up 2 days, 7 min,  1 user,  load average: 0,28, 0,30, 0,49
 08:20:01 up 2 days, 37 min,  1 user,  load average: 0,12, 0,23, 0,26
 13:40:01 up 2 days,  2:19,  7 users,  load average: 0,02, 0,06, 0,07
 22:05:01 up 2 days, 14:22,  7 users,  load average: 0,01, 0,05, 0,07
 14:20:01 up 25 days, 6 min, 11 users,  load average: 0,37, 0,45, 0,51
 14:55:01 up 25 days, 41 min, 11 users,  load average: 0,19, 0,19, 0,31
 15:25:01 up 25 days,  1:11, 11 users,  load average: 0,38, 0,23, 0,22
 10:00:01 up 25 days, 19:46, 11 users,  load average: 0,13, 0,24, 0,26
 09:21:27 up 229 days, 57 min, 10 users,  load average: 0,00, 0,00, 0,00

Load averages

Load averages are shown for 1,5 and 15 minutes intervals
Load averages are not normalized for the number of CPUs in a system
A load average of 1 means a single CPU system is loaded all the time
A load average of 1 on a 4 CPU system it means the system was loaded 25% of the time. Which means the system was loaded for the equivalent of one core for 100% of the time

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Table of Contents

uptime

Calculate boottime in epoch

Output examples

Load averages