Unix/Linux and HPC experts always use the commandline — why?

GUI vs Command Line

• Harder to the trivial things, but easier to do everything else.
• Not everything has a GUI!
• Vastly more powerful and flexible than any (practical) GUI
  • . . .  and can do many things that no GUI can (next page).

Remote and Shared Systems

• Remote systems not usually available via GUI
• Orders of magnitude less resource-hungry than GUI
  • Imagine 100 instances of Aero, Aqua, GNOME/KDE running on Man2's login node. . .