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Miscellaneous
passwd [options] [username]
Users may change their own passwords at any time using this command. The ad-
ministrator root can use the command to change the password of any user on the
system.
su [options] [username]
The su command makes it possible to log in under a different username from a
running session. Specify a username and the corresponding password. The password
is not required from root, because root is authorized to assume the identity of
any user. When using the command without specifying a username, you are
prompted for the root password and change to the superuser (root).
-
halt [options]
To avoid loss of data, you should always use this program to shut down your system.
reboot [options]
Does the same as halt except the system performs an immediate reboot.
clear
This command cleans up the visible area of the console. It has no options.
18.3.3 For More Information
There are many more commands than listed in this chapter. For information about
other commands or more detailed information, the O'Reilly publication Linux in a
Nutshell is recommended.
18.4 The vi Editor
Text editors are still used for many system administration tasks as well as for program-
ming. In the world of Unix, vi stands out as an editor that offers comfortable editing
functions and is more ergonomic than many editors with mouse support.
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Installation and Administration
Use su - to start a login shell for the different user
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Troubleshooting
