Find system uptime in Linux

There are a few different ways to find out the system up time in Linux.

cat /proc/uptime

admin@localhost [~]# cat /proc/uptime
 306350.37 2218975.63
admin@localhost [~]#

Taking the above command one step further, we can run it in the date command to see the system start up date.

date  --date="cat /proc/uptime | awk '{print $1}'seconds ago"

uptime command

[admin@localhost ~]$ uptime
  6:25AM  up 2 days,  6:24, 3 users, load averages: 0.00, 0.00, 0.00
[admin@localhost ~]$

w command

[admin@localhost ~]$ w
  6:27AM  up 2 days,  6:25, 2 users, load averages: 0.00, 0.00, 0.00
 USER             TTY      FROM              LOGIN@  IDLE WHAT
 admin       p1       localhost.  6:09AM    13 su (bash)
 admin       p2       localhost.  6:25AM     - w
[admin@localhost ~]$

Reference links

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