Shell position Variable

When we are learning some frameworks, we usually invoke a script when we start the framework, and pass some parameters to the script, and the script will do different things depending on the parameters we pass, and the parameters we pass are the positional variables.
How did the script identify the parameters we passed?
By .... Such a similar command to get,
For example:./test.sh a B
$: script itself test.sh
$: The first parameter of the script a
$: Second parameter B of the script
Write a script, test.sh in it.
Echo
echo $
Echo
Give test.sh, Empower, execute test.sh AB, view execution results

In this way, you can get the user's instructions in the script to perform different operations.

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Shell position Variable