Passing Parameters in Shell Scripts

Introduction

• Learning how to pass parameters while running shell scripts.
• Using VS Code to create a new file.

Creating a Script

• Open VS Code or use terminal to create a file named arguments.sh.
• Start script with shebang: #!/bin/bash

Running the Script with Parameters

• Example of running a script with parameters (e.g., name, number, country).
  • Command substitution example:
    • Passing parameters like my name, my number, country (e.g., India).

Accessing Parameters

• Access parameters using the syntax:
  • $1 for the first parameter
  • $2 for the second parameter
  • $3 for the third parameter
  • Up to $9 for the ninth parameter
  • $0 returns the name of the script.

Running the Script

1. Save the file.
2. Change permissions: chmod +x arguments.sh
3. Clear the screen and run the script: ./arguments.sh
4. Pass parameters (e.g., name, country, number, tutorial).

Output Example

• First line shows the script name, followed by parameters passed.
• If a parameter is not used, it will show as empty.

Important Notes

• If one parameter is passed, the others will be ignored.
• To pass full names as a single parameter, use quotes: "Ayush Kumar"

Listing All Parameters

• To print all arguments, use: echo "$@"

Counting Parameters

• To count the number of parameters passed, use: echo "$#"

Storing Parameters in Variables

• Example of storing parameter in a variable: name="$1"

Conclusion

• Summary of how to work with parameters in shell scripts.
• Encouragement to practice these skills.

Thank you for watching!