Want to create a permanent record of your restarts? Try this command: reboot is a pseudo-user, as is shutdown, so last shutdown displays all the logged shutdown events. Technically, the last command displays the sessions of specified users, so you could also type last shortname - where shortname is the short name of a user account - to see all the times that particular account logged in, or just last by itself to show all sessions. Mine dates only to October 2013, whereas Adam Engst’s includes 70 restarts since May 2013, and shows several instances when he was restarting repeatedly while trying to isolate a bad DIMM.
You’re presented with a log of all the times you restarted your Mac, back to when the log begins. Open Terminal from /Applications/Utilities, and type last reboot and press Return. If you’re intimidated by Unix, don’t worry, as this one is as simple as it gets. What’s the utility of such details? If you’re troubleshooting flaky hardware, perhaps you want to document how often you’re having to restart, or you might want to look up the exact date of a recent kernel panic when working with tech support.
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