# Linux – How to find the uptime since last wake from standby

linuxstandbyuptime

I want to know the uptime since the last wake from standby.

The command uptime only shows the difference between current time minus the last startup time.

In /var/log/pm-suspend.log, look for the last line looking like this one:
Sun Dec 16 09:30:31 CET 2012: Awake.

Periodically your logrotate will "rotate" logs to prevent them from growing too big, so you may find an empty pm-suspend.log file. In this case, just look for the pm-suspend.log.1 file (you may find also other log files named like pm-suspend.log.2.gz and so on; you can examine them using zcat or zless).