osx - in Terminal, what is the difference between normal mode and switching to bash? -

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when in terminal, greeted prompt saying:

computer_name:~ directory user$ (command input)

then if use command "bash", prompt changes to:

bash-3.2$ (command input)

now understand when use command "python", taken python interpreter, seems pretty same commands usual work when switch bash. explain (if anything) happening here?

when type bash taken new bash instance. if press ctrl + d exit. osx uses bash default shell.


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