Bash script question. Can someone explain to me pls?

Question

In the Bash script, write a simple program that first creates a new file called myfile.txt, then append the string "Hello world" to it. Then print out the size in bytes of myfile.txt.

Answer 1

First write the command with .sh extension and save it then run it on your terminal with bash ./fileName.sh

The contents of fileName.sh (or any other name you want to call it) are:

#!/bin/bash

touch myfile.txt

str="Hello World"

echo $str >> myfile.txt

echo ${#str}