BACKGROUND: A shell provides a command-line interface for users. It interprets user commands and executes them. Some shells provide simple scripting terms, such as if or while, and allow users to make a program that facilitates their computing environment. Under the hood, a shell is just another user program as you know from Minor2 assignment. The file /bin/bash is an executable program file for the bash shell. The only thing special about your login shell is that it is listed in your login record so that /bin/login (i.e., the program that prompts you for your password) knows what program to start when you log in. If you run “cat /etc/passwd”, you will see the login records of the machine.
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