How do I identify on my system after successful boot. weather it was crash or was it a shutdown or reboot or something else?

Question

Depending on the restart of the system, I need to make my application taking some follow up.

my system is get restarted as following:

1. my self as system admin rebooting sudo init 6 or sudo reboot
2. my self as system admin init 0 or sudo shutdown
3. NOT myself, System crash of get frozen and hangs (physically power off and power on)
4. NOT myself, System off, power failure (physically need to power on)

Now, when I am not involved the system is either having reboot or shutdown where I have no, idea for those cases.

But in my every power down/power off I have one preset problem where second hardware I need to send commands for setting configuration which match with my box.

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So, how can I detect the previous actions? Was it frozen, was it shutdown, was it reboot or was it etc. etc. So that I can on boot read the log and take related actions?

Answer 1

You might want to have a look at the last command.