Command line and watt steam engine: what they have in common

1. Step 1. Command line — evolved from — Typewriter. The teletype was a printing terminal.
2. Step 2. Typewriter — works like — Movable type. Each typebar carries a piece of movable type pressed against the paper.
3. Step 3. Movable type — is part of — Gutenberg printing press. Text is set from metal type.
4. Step 4. Gutenberg printing press — evolved into — Rotary printing press. Cylinders instead of a flat press.
5. Step 5. Rotary printing press — has part — Watt steam engine. The first rotary presses were steam-driven.

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