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 a function that takes parameters?

Sure! Here's an example: greet() { echo 'Hello, $1!'; }. You can call it with greet Alice to output 'Hello, Alice!'.

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

In shell scripts, you can use the return command to return an exit status. For example, add() { return $(($1 + $2)); }.

How do I capture the return value of a function?

You can capture the return value by using the $? variable right after calling the function. For example: add 5 3; result=$?.