Warning: Permanently added '192.168.0.41' (RSA) \
to the list of known hosts.
[email protected]'s password:
matthew@babbage~$After entering your password, you can work on the remote computer, which
you can confirm by noticing the changed prompt that now uses the name of
the remote computer on which you are working. Again, because you are using
ssh, everything you enter on the keyboard in communication with the remote
computer is encrypted. When you log out, you return to the shell on your
computer:
Click here to view code image
matthew@babbage~$ logout
matthew@seymour:~$
User Accounts
A good place to start this section is with the concept of user-based security.
For the most part, only two types of people access the system as users.
(Although there are other accounts that run programs and processes, here we
are talking about accounts that represent human beings rather than something
like an account created for a web server process.) Most people have a regular
user account. These users can change anything that is specific to their
accounts, such as the wallpaper on the desktop, their personal preferences,
and the configuration for a program when it is run by them using their
account. Note that the emphasis is on anything that is specific to their
accounts. This type of user cannot make system-wide changes that could
affect other users.
To make system-wide changes, you need to use super user privileges, such as
can be done using the account you created when you started Ubuntu for the
first time (see Chapter 1, “Installing Ubuntu and Post-Installation
Configuration”). With super user privileges you have access to the entire
system and can carry out any task—even destructive tasks. To help prevent
this from happening, this user does not run with these powers enabled at all
times but instead spends most of the time as a regular user.
To use super user privileges from the command line, you need to preface the
command you want to execute with another command, sudo, followed by a
space and the command you want to run. As a mnemonic device, some think
of this as “super user do.” When you press Enter (after typing the remaining
command), you are prompted for your password, which you should type and
then press the Enter key. As usual on any UNIX-based system, the password