manual/source/C/command_line.rst

Appendix C Command line
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The command line is text interface to your computer and an alternative to graphical user interfaces like windows. It typically involves typing text commands into a terminal to perform some operation. Although not necessary to learn, it can be helpful. The terminal (Ctrl + Alt + T) is a command line running in a window. 

An exhaustive tutorial on the command line is a bit beyond the scope of the manual. The man command  brings up the user manual and can be used to learn more about a commands use, its options and inputs. If you wanted to learn more about the df (disk free) command, enter the following into a command line: 

.. code::
   
   man df

This will show you the user manual for the df command containing and explanation of the command and other useful information. For example is the -h option gives a human readable output.

.. code::
  
   df -h 

will make a much nicer output than 

.. code:: 
   
   df