The Terminal Stack Explained: From TTY and Shell to ANSI Escapes and Building a TUI
This article provides a comprehensive, deep-dive explanation of the full terminal stack — from basic vocabulary (terminal, shell, TTY, console) to advanced concepts like ANSI escape sequences, PTYs, and raw/canonical modes. It traces the historical origins of these terms (all originally describing the same physical 1960s machine) and builds up to practical knowledge, including how to build a TUI (Text User Interface) app from scratch. The piece demystifies what happens under the hood when tools like vim take over the screen, explaining raw mode, escape sequences, and the layered architecture that modern terminal emulators rely on.
Key quotes
They used to be the same thing. This is the key insight. All four words originally described the same physical object.
In the 1960s, you interacted with a computer by sitting at a machine with a keyboard and a printer. That machine had three names depending on who was talking about it.
Most developers use a terminal for years before realizing they don't actually know what a terminal is. They know how to use one. They couldn't define one.
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