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Bash

Bash

In depth

Tool

Also known as: Bourne Again Shell

The most widely used Unix shell. You drive the terminal with it, write scripts and automate tasks.

Bash, explained

Written by EduVerse

What it is

Bash is a shell: the program that reads the commands you type in a terminal and runs them. It’s also a scripting language, so you can save a series of commands in a .sh file and run them as one. It’s the default shell on many Linux systems, and on Windows it comes with Git as Git Bash.

Why teams use it

Developers repeat the same steps all day: build, copy files, restart a service. A small Bash script turns that into one command, and it runs on almost any Linux server or CI machine without installing anything extra. Once a script grows lots of logic and error handling, many teams move it to a language like Python instead.

An example from work

A colleague tells you to run deploy.sh before testing. You type ./deploy.sh and get “Permission denied”. The file starts with #!/bin/bash, but it isn’t marked as executable yet. After chmod +x deploy.sh it runs, printing each step while it builds and copies your app.

Our own explanation, not a quote from the book.

In the book

Sentences from The Software Realm, Decoded that mention Bash, exactly as printed.

  • What they say
    “Open a terminal and run this command.”
    What they mean
    Open the text-based interface (Terminal on Mac/Linux, PowerShell or Git Bash on Windows) and type exactly what I’m about to show you, then press Enter.
    Chapter 1 · 1.2.1 What Is the Terminal, Really? · p. 24Open in the free preview
  • The Senior developer, from the book cover
    Senior developer
    “Windows developers use WSL or Git Bash to get Linux commands.”
    Chapter 1 · 1.2.4 Why Linux Matters (Even on Mac and Windows) · p. 25Open in the free preview

Where it fits

Shell scripting, terminal work, automation

Coverage in the book

In depth

Covered in depth: multiple pages with explanations, examples and simulations.

Appears in