References:

Is each terminal window of Bash a separate shell? (n.d.). Retrieved February 7, 2020, from [ Ссылка ]
Ward, B. (2014). How Linux Works: What Every Superuser Should Know (2nd ed.). No Starch Press. Pages 292-294
What is the difference between interactive shells, login shells, non-login shell and their use cases? (n.d.). Retrieved February 7, 2020, from [ Ссылка ]
What is the intended purpose of a login shell? (n.d.). Retrieved February 7, 2020, from [ Ссылка ]

Why do we have login, non-login, interactive, and non-interactive bash shells? (n.d.). Retrieved February 7, 2020, from [ Ссылка ]

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