Installing the OpenSSH server and client applications is simple. To install the OpenSSH client application on Ubuntu systems, use this command at a terminal prompt:
sudo apt-get install openssh-client
To install the OpenSSH server application and its supporting files, use this command at a terminal prompt:
sudo apt-get install openssh-server
If the DHCP server assigns us a different IP each time, or it simply never occurred to us to need to know this detail, we need to retrieve it using the following command:
$ ifconfig
You do not need root privileges to run this command. Once we have the IP (e.g., 192.168.1.23), we can try connecting from another machine:
ssh <username>@<hostip>