A command line is a text – based interface which can be used to input instructions to a computer system. The Linux command line is provided by a program called the shell. Over the long history of UNIX – like systems, many shells have been developed.
When a shell is used interactively, it displays a string when it is waiting for a command from the user. This is called the shell prompt. When a regular user starts a shell, the default prompt ends with a $ character.
The $ is replaced by a # if the shell running as the super user, root. This makes it more obvious that it is a super user shell. Which helps to avoid accidents and mistakes in the privileged account.
Using bash to execute commands can be powerful. The bash shell provides a scripting language that can support automation of tasks. The shell has additional capabilities that can simplify or make possible operations that are hard to accomplish efficiently with graphical tools.
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