Question : How to check when was my linux system last rebooted and how long was the system running ?
Answer : The are several command to check last system rebooted.
1. Check last rebooted using “who -b” command :
[root@server ~]# who -b
system boot 2014-08-16 09:34
2. Check last rebooted using “last reboot” command :
[root@server ~]# last reboot reboot system boot 2.6.32-431.el6.x Sat Aug 16 09:34 - 01:11 (15:36) reboot system boot 2.6.32-431.el6.x Tue Aug 12 19:39 - 00:13 (04:33) reboot system boot 2.6.32-431.el6.x Mon Aug 11 23:08 - 23:59 (00:50) reboot system boot 2.6.32-431.el6.x Tue Aug 5 11:47 - 05:41 (5+17:54) reboot system boot 2.6.32-431.el6.x Tue Aug 5 09:03 - 11:18 (02:15) reboot system boot 2.6.32-431.el6.x Tue Aug 5 08:58 - 09:03 (00:04) reboot system boot 2.6.32-431.el6.x Fri Jul 18 00:47 - 00:51 (00:04) reboot system boot 2.6.32-431.el6.x Sun Dec 8 11:22 - 11:23 (00:01) reboot system boot 2.6.32-431.el6.x Sun Dec 8 10:28 - 10:30 (00:01) reboot system boot 2.6.32-431.el6.x Sat Dec 7 21:54 - 22:40 (00:46) reboot system boot 2.6.32-431.el6.x Sat Dec 7 19:46 - 21:54 (02:08) wtmp begins Sat Dec 7 19:46:12 2013
3. Check how long was the system running using “uptime” command :
[root@server ~]# uptime 01:13:34 up 15:38, 1 user, load average: 0.04, 0.08, 0.04
Use uptime command to deduce last reboot time. The uptime command will show the current time and how long the system was running