How do I execute a bash script in Terminal?

Question

I have a bash script like:

#!/bin/bash

echo Hello world!

How do I execute this in Terminal?

Answer 1

You could do:
sh scriptname.sh

Answer 2

And yet one more way

. /path/to/script

What is the meaning of the dot?

Answer 3

Change your directory to where script is located by using cd command

Then type

bash program-name.sh