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You’ve been there - after putting your backpack in a frigid car, walking against the Wisconsin wind, or biking across the frozen lake, you arrive at work. You rest your palms on the keyboard to begin typing your password, and recoil in pain from the sudden cold of the metal sucking the heat from your skin.

How do you quickly warm up a laptop? Make it do a lot of work.

Here’s a one-line, built-in command that will peg your CPU to 100%: