Environment Variables

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Environment Variables

Environment Variables

Environment variables like $HOME, $USER, and $PATH are set by the system or shell and are available to every script and program that runs. They carry configuration and context, such as the current user's home directory. You can read them just like any other variable, with $.

Note: Run env or printenv in a terminal to see all environment variables currently set.

Example: Environment Variables

bash

#!/bin/bash
echo "Home directory: $HOME"
echo "Current user: $USER"
echo "Shell: $SHELL"

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Variable Basics
String Variables & Quoting Rules
Quoting Rules
Integer Arithmetic
Environment Variables
Environment Variables & export
readonly Variables
readonly and unset
export
Special Variables
Special Variables ($0 $1 $?)
Introduction to Arrays
Default Values & Parameter Expansion Basics

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Environment Variables

Environment Variables

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