Shipping container and typewriter: what they have in common

1. Step 1. Shipping container — works like — Containers (Docker). Standard packaging for an application — like a shipping container for cargo.
2. Step 2. Containers (Docker) — uses — Linux. Mechanisms of the Linux kernel.
3. Step 3. Linux — was inspired by — Unix. A Unix-like system.
4. Step 4. Unix — uses — Command line. The shell.
5. Step 5. Command line — evolved from — Typewriter. The teletype was a printing terminal.

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