How to Pass Command Line Arguments in Shell Scripting

Bash Command Line Arguments Explained

Introduction

Hello Folks 🙂 In this article, we will learn different ways of passing command-line arguments to Bash scripts.

Bash scripts accept arguments sequentially and can also parse them as options.

Positional Command Line Arguments

Bash input arguments are accessed using positions like $1, $2 ... $n.

$@ → Expands into separate parameters.

$* → Single string.

$# → Total arguments.

$0 denotes the script name.

Example - Command Line Script

#!/bin/bash
echo "Script name: $0"
echo "Input Arg 1: $1"
echo "Input Arg 2: $2"
echo "Input Arg 3: $3"
echo "-----------"
echo "All Input Args: $*"
echo "All Input Args: $@"
echo "Input Arg count: $#"

Run:

$ bash demo.sh 1 2 3

Conclusion

You learned how Bash handles command-line arguments and how to use them effectively.