Linux and screw press: what they have in common

1. Step 1. Linux — was inspired by — Unix. A Unix-like system.
2. Step 2. Unix — uses — Command line. The shell.
3. Step 3. Command line — evolved from — Typewriter. The teletype was a printing terminal.
4. Step 4. Typewriter — works like — Movable type. Each typebar carries a piece of movable type pressed against the paper.
5. Step 5. Movable type — is part of — Gutenberg printing press. Text is set from metal type.
6. Step 6. Gutenberg printing press — has part — Screw press. Gutenberg adapted the screw press known from pressing grapes.

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