Note that [[ is actually a command/program that returns either 0 (true) or 1 (false). Any program that obeys the same logic (like all base utils, such as grep(1) or ping(1)) can be used as condition, see …

Mar 31, 2022 · Just like any other programming language, bash scripting follows a set of rules to create programs understandable by the computer. In this section, we will study the syntax of bash scripting.

This chapter briefly summarizes the shell’s ‘building blocks’: commands, control structures, shell functions, shell parameters, shell expansions, redirections, which are a way to direct input and output …

Basic Syntax Here are some basic rules for using Bash in scripts: Comments: Comments start with a # and Bash ignores them. Command Order: Commands run one after the other, from top to bottom. …

Jan 20, 2026 · Conditional statements in shell scripting allow us to make decisions and control the flow of our script based on certain conditions. They enable our script to execute different sets of …

Learn the fundamentals of shell scripting in Unix. Explore essential commands, scripting techniques, and best practices to enhance your programming skills.

This tutorial is written to help people understand some of the basics of shell script programming (aka shell scripting), and hopefully to introduce some of the possibilities of simple but powerful …

Sep 22, 2025 · Shell is a macro processor which allows for an interactive or non-interactive command execution. Scripting allows for an automatic commands execution that would otherwise be executed …

What is a Shell Script? A shell script is a text file containing a sequence of commands that the Linux shell can execute. The “shell” is a command-line interpreter (e.g., Bash, Zsh) that acts as a bridge …

Oct 9, 2025 · While Bash is the focus of this tutorial, other shells like the Korn shell (ksh), C shell (csh), and Z shell (zsh) are also available, each with its own syntax and features.