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Everyone knows that command uptime shows running time of Linux machine. Is there a similar command for sleep and/or hibernate mode? To be clear: I want to know wake up time of my system.

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Possible Duplicate:
How to find the uptime since last wake from standby

Top Answer:
"In /var/log/pm-suspend.log, look for the last line looking like this one:

Sun Dec 16 09:30:31 CET 2012: Awake. That's your last wakeup time. You can calculate your uptime since then the way Paul suggested."
-Steps

Will
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