In the vocabulary.com
A shebang is a thing or a group, used in the phrase "the whole shebang." When your teacher says the test will cover the whole shebang, she means everything you've studied is fair game.
In the urban dictionary
The whole shabang: Including everything that will make up the entirety of the main object in question or that will complement it.
Are they all correct(maybe)?
What is the difference between them?