Mac OS X lock screen immediately

The one thing nice about Windows is being able to lock screen quickly when you leave your desk by pressing Windows-L.

I have been wondering how to do this with my Mac. Now that I finally bothered to actually google for it for a while, this is the best I found so far:

open /Applications/Utilities/Keychain\ Access.app/Contents/Resources/Keychain.menu
This adds a lock icon in the menu bar. It's not quite as convenient as Win-L, but does the trick.

 From donmontalvo at apple.stackexchange.com

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