Changes

* <code>$#</code> represents the number of parameters (not including the script name)

* Displays messages to the terminal followed by a newline. Use the <code>-n</code> option to suppress the default newline.

* Arguments are usually double quoted.

* The <code>read</code> command allows obtaining user input and storing it in a variable. Everything is captured until the Enter key is pressed.

echo Hello $name

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The purpose of the if statement is execute a command or commands based on a condition. The condition is evaluated by a test command, represented below by a pair of square brackets

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The <code>test</code> command can be used in two ways:

Check <code>man test</code> for more details

A for loop is a very effective way to repeat the same command(s) for several arguments such as file names. The syntax and example of for command is shown below: