Introduction to Bash
Glue the shell, automate the boring parts.
What Bash is, why it matters, and how to navigate this track.
Bash is the shell on nearly every Linux and Mac — the glue that automates everything in a terminal.
What is Bash?
Bash is both an interactive command line and a scripting language for chaining programs together.
A few lines of Bash can replace hours of repetitive clicking and typing.
Your first example
Here is Bash saying hello. Read it top to bottom — every line earns its place.
#!/usr/bin/env bash
echo "Hello, world!"Hello, world!
Why learn Bash?
- It is everywhere — servers, CI pipelines, dev machines.
- Automate setup, deploys, backups, and chores.
- Understanding the shell makes every other tool easier.
Where it is used
- Automation & scripting
- DevOps & CI/CD
- Server administration
- Glue between tools
How this track works
Every topic here has four views, switchable with the tabs at the top of each page:
- Learn — the clear, practical walkthrough you are reading now.
- Deep — every detail: edge cases, the full API, and what is really happening.
- Reference — a scannable, no-fluff lookup for when you already know the shape.
- Cheatsheet — the one-page summary, printable, for quick recall.
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HTML Headings
h1 through h6 are the page’s table of contents. Use them for structure, never for size — that’s what CSS is for.
HTML Headings
h1–h6 are instances of HTMLHeadingElement. They take no special attributes — only the global set and ARIA — but there’s real depth in how they form the document outline and what you can do with them from JavaScript.
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