Interactive Non-interactive Login Non-login

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Interactive : as the term implies means that the commands are run with user-interaction from keyboard
Non-interactive: the shell is probably run from an automated process so it can’t assume if can request input or that someone will see the output
Login: means that the shell is run as part of the login of the user to the system. Typically used to do any configuration that a user needs/wants to establish his work-environment
Non-login: Any other shell run by the user after logging on, or which is run by any automated process which is not coupled to a logged in user

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