How do I create functions in Bash scripts?

How do I create functions in Bash scripts?

Creating functions in Bash scripts is straightforward. You can define a function using the following syntax:

function_name() {
    # commands
}

For example:

greet() {
    echo "Hello, $1!"
}

You can call this function by using greet John.

Can you give me an example of a function that takes multiple arguments?

Sure! Here's an example of a function that takes two arguments:

add() {
    sum=$(( $1 + $2 ))
    echo "The sum is: $sum"
}

You can call it like this: add 5 10.

What if I want to return a value from a function?

In Bash, you can use the return statement to return an exit status, but to return a value, you typically use echo. For example:

multiply() {
    echo $(( $1 * $2 ))
}

You can capture the output like this:

result=$(multiply 4 5)
echo "Result: $result"