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Published in:
2011 | OriginalPaper | Chapter
UNIX Shell Introduction
Authors : Associate Professor Yukun Liu, Professor Yong Yue, Professor Liwei Guo
Published in: UNIX Operating System
Publisher: Springer Berlin Heidelberg
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Known in Chapter 2, UNIX provides a text-based interface or a CUI interface (see Figure 2.1). This interface is a shell, which bridges between the UNIX kernel and users. In other words, when typing in a command line in a terminal system or a terminal window, users of UNIX work on one of the shells. When a user logs on and enters a terminal system, UNIX starts running a program that is a UNIX shell (Bach 2006; Miller et al 2000; Mohay et al 1997; Quarterman et al 1985; Ritchie et al 1974; Sarwar 2006). When the shell starts running, it gives a shell prompt ($ for the Bourne or Korn shell, or % for the C shell) and waits for the user to type in commands (Bourne 1978; Bourne 1983; Joy 1980; Korn 1983; Rosenblatt et al 2002). The UNIX shell executes commands that the user types on the keyboard.