What are some useful functions in shell scripting?

What are some useful functions in shell scripting?

Shell scripting functions allow you to group commands for reuse. Common functions include file manipulation and text processing.

Can you give me an example of a simple shell function?

Sure! Here's a simple function that greets a user:

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

You can call it with greet John.

How do I pass arguments to a shell function?

You can pass arguments to a shell function by using $1, $2, etc. For example, in the greet function, $1 is the name you pass.

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

In shell scripting, you can use the return statement to return an exit status. For returning values, you can use echo and capture it.