To give a command to a UNIX system you type the name of the command, along with any associated information, such as a filename, and press the (Return) key. The typed line is called the command line and UNIX uses a special program, called the shell or the command line interpreter, to interpret what you have typed into what you want to do. The components of the command line are:
1. The command;
2. Any options required by the command the command's arguments (if required).
3. For example, the general form of a UNIX command is:
command [-option(s)] [argument(s)]
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