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How to tell if a Linux machine was hard powered

Posted on 2009-05-08
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Last Modified: 2013-12-16
I have a retail system that needs to be kept up to date and on at all times unless rebooted by admin. How can I tell if an employee shuts down the machine by pressing the power button or umplugging the power cord.I need to know if the shutdown was gracefull or hard.
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Question by:atorex
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by:mutahir
ID: 24339489
You can check all the boot/shutdown logs in /var/log/messages
This link have some good info : http://www.cyberciti.biz/tips/linux-shutdown-command-and-logfile.html
hope this helps
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by:SalmanZG
ID: 24339515
Simply use the command:uptime
This will tell you since how long the system has been up.

I got so used to this that I created a script for windows too.
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by:atorex
ID: 24339619
mutahir the link you gave me is good, thanks but I need to know
How can I deferenciate between gracefull and hard shutdown
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by:KrazyRhino
ID: 24339714
atorex... if there was power removed there would be no log entry as it would not have time to write it.
Combined with the uptime command that salman said it should give you your answer.
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SalmanZG earned 500 total points
ID: 24339974
My mistake for not understanding your question properly.

One easy option is to put a script at run level 6 (shutdown). This will be executed on normal shutdown / reboot and you can append some info to a log file (e.g. 'last reboot') for later analysis.


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by:small_student
ID: 24340069
Simply use the command last

This is the output from my laptop, its a  fedora 9 , all linux distros have this command, as you can see it tells you when reboots and poweroff happens

[root@server1 ~]# last
root     pts/0        :0.0             Sat May  9 02:17   still logged in  
root     tty1                          Sat May  9 02:16   still logged in  
reboot   system boot  2.6.25-14.fc9.i6 Sat May  9 02:15          (00:26)    
root     pts/0        :0.0             Fri May  8 17:08 - down   (05:47)    
root     tty1                          Fri May  8 17:06 - down   (05:50)    
reboot   system boot  2.6.25-14.fc9.i6 Fri May  8 17:06          (05:50)    
root     pts/0        :0.0             Sat May  2 18:35 - down   (07:15)    
root     tty1                          Sat May  2 18:34 - down   (07:16)    
reboot   system boot  2.6.25-14.fc9.i6 Sat May  2 18:34          (07:17)    

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by:small_student
ID: 24340074
Another solution would be to attach a UPS and monitor the UPS logs
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by:omarfarid
ID: 24340091
like small_student suggested, use

last | grep boot
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by:jools
ID: 24375816
have a lookat `dmidecode` There is a section there that says Wake-Up type, I've only just noticed it so don't know if this is just a "setting" or it is reporting how the system was powered up.

Having said that, I always use the way that ha been mentioned above.


Handle 0x0100, DMI type 1, 25 bytes.

System Information

        Manufacturer: HP

        Product Name: ProLiant DL380 G3

        Version: Not Specified

        Serial Number: BLAHBLAHBLAH

        UUID: Horrible Long string etc.

        Wake-up Type: Power Switch

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Author Closing Comment

by:atorex
ID: 31579607
This looks like the best way to go thanks
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