Using Linux you will use a lot command-line tools. Using command-line tools requires the use of a shell. A shell is a program that accepts and interprets text-mode commands. If you log into Linux using a text-mode login screen you will see the shell. If you log into Linux using a graphical user interface (GUI) login screen, you'll have to start a terminal emulator. After that you can input commands.

Let's start with the command uname. This command show what operating system is.

$ uname
Linux

If you want more information, you can use -a option.

$ uname -a

See you the next post!