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A Practical Guide to Red Hat® Linux® 8 by Mark G. Sobell

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The Command Line

The shell executes a program when you give it a command in response to its prompt. For example, when you give the ls command, the shell executes the utility program named ls. You can cause the shell to execute other types of programs—such as shell scripts, application programs, and programs you have written—in the same way. The line that contains the command, including any arguments, is called the command line. In this book the term command refers to the characters you type on the command line as well, as to the program that action invokes.

Syntax

Command line syntax dictates the ordering and separation of the elements on a command line. When you press the RETURN key after entering a command, the shell scans the command line ...

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