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17
Working with the Shell
When booting your Linux system, you are usually directed to a graphical user interface
that guides you through the login process and the following interactions with the system.
Although graphical user interfaces have become very important and user-friendly, using
them is not the only way to communicate with your system. You can also use a text-
oriented communication like a command line interpreter, usually called the shell, where
you can enter commands. Because Linux provides options to start shell windows from
the graphical user interface, you can easily use both methods.
In administration, shell-based applications are especially important for controlling
computers over slow network links or if you want to perform tasks as root on the
command line. For Linux "newbies" it might be rather unusual to enter commands in
a shell, but you will soon realize that the shell is not only for administrators—in fact,
using the shell is often the quickest and easiest way to perform some daily tasks.
There are several shells for UNIX or Linux. The default shell in SUSE® Linux Enterprise
is Bash (GNU Bourne-Again Shell).
This chapter deals with a couple of basics you need to know for using the shell. This
includes the following topics: how to enter commands, the directory structure of Linux,
how to work with files and directories and how to use some basic functions, the user
and permission concept of Linux, an overview of important shell commands, and a
short introduction to the vi editor, which is a default editor always available in Unix
and Linux systems.
Working with the Shell
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Troubleshooting
