My server restarted twice, i need to know in what time my server restarted ,
i know these command help to know the uptime , i need only when its start restarted

ex

[root@basema log]# grep restart messages
Sep 30 04:04:09 basema syslogd 1.4.1: restart.
Oct 5 01:51:21 basema syslogd 1.4.1: restart.

[root@basema log]# last | grep boot
reboot system boot 2.6.9-42.ELlarge Fri Oct 5 01:51 (12:26)
reboot system boot 2.6.9-42.ELlarge Thu Oct 4 07:05 (1+07:11)
reboot system boot 2.6.9-42.ELlarge Thu Oct 4 06:44 (00:17)
reboot system boot 2.6.9-42.ELlarge Thu Oct 4 01:01 (06:00)


[root@basema log]# last -x|grep shutdown | head -1
shutdown system down 2.6.9-42.ELlarge Thu Oct 4 07:02 - 14:27 (1+07:25)



[root@basema log]# last reboot | head -1
reboot system boot 2.6.9-42.ELlarge Fri Oct 5 01:51 (12:37)

[root@basema log]#

[root@basema log]# who -b

system boot Oct 5 01:51

cat /var/log/messages.log | grep "Kernel command line"

..would likely do the job for you. The only time that phrase is issued is during boot. NOTE - you can likely grep the syslog file too, it should contain the similar information. Though at a glance, it looks like you already have identified enough info yourself there, to determine when it rebooted.. No?

I think that if it restarts "spontaneously" (be it via power-glitch,
software bug or hardware failure) you won't see an indication of it
going away, only of the start-up phase.



Cheers,
Tink