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The shell is a black screen which only shows what is expected of the indicator command prompt which is called, most of Linux systems tend to show an indicator in the user name, the name of the machine and the current working directory, as shown in the picture below:

The form of display is given by the prompt shell variable called PS, this means that setting this variable to change the look of the prompt, to practice the commands are going to change this variable to show the results of the variation in the indicator system.

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As with other Unix operating systems, Linux has a shell or shell script which makes so-called intermediary between the user and the operating system. One of the most used shell is called bash (which stands for Bourne Again SHell). This shell has a very simple interface, since it is a black screen in text mode which is a type indicator that it expects orders. This indicator is called the prompt. The following image shows a linux terminal show bash.