Prevent Mac from Sleeping with pmset Command: A Simple Solution | MacOSXHints

Learn how to prevent your Mac from sleeping using the pmset command. Follow a few simple steps in Terminal and your Mac won't fall asleep anymore!

We've run a number of hints about preventing a Mac from sleeping, such as this and this.

I came across another really simple way to do this, using the pmset command. Just run this command in terminal:

pmset noidle

Terminal will display the following text:

Preventing idle sleep (^C to exit)...

To allow the Mac to go back to sleep, according to its current Energy Saver settings, just press Control-C.

via MacOSXHints.com http://hints.macworld.com/article.php?story=20130620032443758