3. Variables

3.1. single quotes

$ name='José Jiménez'
$ echo 'My name is $name'
My name is $name

3.2. double quotes

$ name="José Jiménez"
$ echo "$name"
My name is José Jiménez

3.3. Script arguments

$0 - Script name $1...``$9`` - positional parameter number 1 to 9 $@ - all parameters