How to pass variables to functions?

In shell scripts, you can pass variables to functions by using positional parameters. Here's how to do it:

1. Define the Function: Create a function that takes parameters.

   my_function() {
       echo "Parameter 1: $1"
       echo "Parameter 2: $2"
   }
   

2. Call the Function with Arguments: When you call the function, provide the arguments you want to pass.

   my_function "Hello" "World"
   

3. Accessing Parameters: Inside the function, you can access the passed arguments using $1, $2, etc., where $1 is the first argument, $2 is the second, and so on.

4. Example Script:

   #!/bin/bash
   
   # Define a function that takes two parameters
   greet() {
       echo "Hello, $1!"
       echo "Welcome to $2."
   }
   
   # Call the function with arguments
   greet "Alice" "Linux"
   

In this example, when you run the script, it will output:

Hello, Alice!
Welcome to Linux.

This demonstrates how to pass and use variables in functions in a shell script.