How can I use functions in shell scripts?

How can I use functions in shell scripts?

You can define a function in a shell script using the syntax: function_name() { commands; }. For example, greet() { echo 'Hello, World!'; }.

Can you show me an example of calling a function?

Sure! After defining the function, you can call it simply by using its name: greet will output 'Hello, World!'.

What if I want to pass arguments to the function?

You can pass arguments by including them in the function call. For example, greet() { echo 'Hello, $1!'; } and call it with greet Alice.

How do I return a value from a function?

You can use the return statement to return an exit status, or you can echo a value and capture it using command substitution.