ODOC: About talk command
Talk with other logged in users.
First you can install talk by simply enter on the terminal following command,
praveen@praveen:~$ sudo apt-get install talk
talk person [ttyname]
person -> If you wish to talk to someone on your own machine, then person is just the person’s login name. If you wish to talk to a user on another host, then person is of the form ‘user@host’.
ttyname -> If you wish to talk to a user who is logged in more than once, the ttyname argument may be used to indicate the appropriate terminal name, where ttyname is of the form ‘ttyXX’ or ‘pts/X’.
Typing the above command would start a talking session with the user praveen.