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Learn BASH Scripting - Pre-Requisites Skill & Setup Environment
Before writing your first line of BASH, there are several basic skills and tools you need to prepare: mastery of basic Linux CLI commands, choosing your learning environment (Linux native, WSL2, or macOS), an editor with ShellCheck, and verifying that the BASH interpreter runs properly.
August 2, 2026
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#1
Learn BASH Scripting - History, Background & Why BASH
Tracing the origins of the shell: from the Bourne Shell (1979) to BASH, born at the hands of Brian Fox (1989), why BASH became the de facto standard on almost all Linux servers, the differences between BASH and other shells as well as high-level languages, and when you should choose which.
August 2, 2026
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#2
Learn BASH Scripting - Shebang, Execution Modes & First Script
Writing your first BASH script correctly: understanding the shebang line and the difference between #!/bin/bash and /usr/bin/env bash, setting execution permission with chmod +x, and dissecting the three ways to run a script — as a program, as an interpreter argument, and as a source.
August 2, 2026
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#3
Learn BASH Scripting - Introduction to Variables & Environment Variables
Dissecting the concept of variables in BASH: naming and declaration rules, accessing with $VAR and ${VAR}, the difference between local variables and environment variables (export, readonly, unset), a list of important built-in variables like $PATH, $HOME, and $USER, and the practice of building scripts that read the environment correctly.
August 2, 2026
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#4
Learn BASH Scripting - Quoting, Escaping & Word Splitting
Dissecting BASH's quoting mechanisms: when to use single quotes, double quotes, or a backslash, how word splitting works with IFS, and why "$@" is always safer than $@ — with a real-world example of a file named with spaces that often breaks scripts.
August 2, 2026
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#5
Learn BASH Scripting - Command Line Arguments & Special Parameters
Mastering how to pass data from the outside into a script through positional parameters ($1, $2, ${10}), understanding special parameters ($0, $#, $@, $*, $$, $?), and using shift to consume arguments sequentially along with the traps that most often make scripts fail silently.
August 2, 2026
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#6
Learn BASH Scripting - Interactive User Input & Menus with read
Building scripts that communicate two-way with the user: mastering the read command with the -p, -s, -t, -n, -a flags, building interactive menus with select, and input validation patterns that are immune to empty input, wrong formats, and password confirmation.
August 2, 2026
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#7
Learn BASH Scripting - Globbing & Pathname Expansion
Mastering how bash expands patterns into real file lists: the *, ?, [...] wildcards, extglob, brace expansion {1..10}, globstar **, shopt options (nullglob, failglob, dotglob, nocaseglob), and the important habit of using globs and never parsing ls output inside scripts.
August 2, 2026
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#8
Learn BASH Scripting - Arithmetic Operations & Mathematical Evaluation
Handling numbers inside your scripts: understanding the limitations of bash integers, arithmetic expansion $(( )), the + - * / % ** operators, the legacy let and expr commands, floating point calculations with bc, and building a realistic disk usage calculator.
August 2, 2026
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#9
Learn BASH Scripting - Conditionals & Test Operators
Giving your scripts the ability to make decisions: the if/elif/else/fi structure based on exit status, the difference between test [ ] (POSIX) and [[ ]] (bash), test operators for strings, numbers, and files, plus && and || short-circuiting along with ready-to-use monitoring script patterns.
August 2, 2026
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