You almost certainly have speed dial set up on your home, office and mobile phone. It saves time, ensures against a failing memory and allows you to work smarter.

Devotees of the command line don’t have to be left out in the cold. One of the crown jewels of GNU/Linux is that every user, be he ne’er so base, has at his or her fingertips the kind of power of which even Caligula could not dream. Alright, I’m exaggerating—a little.