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When the shell starts up, it initializes itself, then types a
promptcharacter, often a percent or dollar sign, on the screen and waits for the user to type a command line.
When the user types a command line, the shell extracts the first word from it, where word here means a run of characters delimited by a space or tab. It then assumes this word is the name of a program to be run, searches for this program, and if it finds it, runs the program. The shell then suspends itself until the program terminates, at which time it tries to read the next command.
"(Tanenbaum & Bos, 2015, p. 726)
De facto, ao longo de todo o semestre, estivemos a interagir com um SO GNU/Linux através de uma shell, mais especificamente a bash - a Bourne Again SHell (que é um clone da shell original UNIX Bourne SH ell -