Ubuntu openssh package installation

Ubuntu openssh package has 2 versions, the openssh-server and openssh-client. The openssh-server contains ssh, scp and sftp services. The ssh is a secure shell service. The scp is a secure copy service and the sftp is a secure ftp client service. These three services will be available when you install the openssh package. They are controlled by one daemon which is called sshd server.

Here is an example of Ubuntu openssh-server package installation using apt-get:

luzar@ubuntu:~$ sudo apt-get install openssh-server
Reading package lists... Done
Building dependency tree
Reading state information... Done
openssh-server is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
luzar@ubuntu:~$

The example above shows that openssh-server already installed in my system. That's what the apt-get install do. It'll read the package state in the system, check whether it has been installed and update, and then compare it with the latest version available in Ubuntu support.

The openssh-client contains rlogin, rsh, and rcp services. The rlogin is a remote login service. The rsh is a remote shell service and the rcp is a remote copy service.

Here is an example of Ubuntu openssh-client package installation using apt-get:

luzar@ubuntu:~$ sudo apt-get install openssh-client
Reading package lists... Done
Building dependency tree
Reading state information... Done
openssh-client is already the newest version.
openssh-client set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
luzar@ubuntu:~$