College of Engineering & CS Wright State University Dayton, Ohio 45435-0001

CEG 333: Introduction to Unix Prabhaker Mateti Remote Computing: telnet and ssh

These two programs allow a user to login to a computer remotely (that is, over a network connection).

NEVER use telnet on a public network without encryption. This makes it very easy for people to capture password or other information when it travels over the network. The ssh (Secure SHell) program encrypts the connection so no one can listen in.

Once logged in, a shell runs on the remote machine and can execute commands just as if the user were sitting there in person. These commands are never executed on the user's machine, but on whatever remote machine ssh is connected to.

To open an ssh connection, run the command "ssh remote_username@remote.host". For example, to connect to the CaTS server named "unixapps1" and login as the user "w000xyz", type "ssh w000xyz@unixapps1.wright.edu".