ssh [options] [user@]hostname [command]
SSH is actually an Internet protocol that enables you to work on remote hosts
across a network. SSH is also the name of a Linux program that uses this protocol
to enable operations on remote computers.
7.12.2.4 Miscellaneous
passwd [options] [username]
Users may change their own passwords at any time using this command. The
administrator 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 dierent 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). Use
su - to start a login shell for a dierent user.
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.
7.12.3 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.
114 Start-Up
