Using talk for an online conversation

talk lets you start up a two-way conversation with someone else logged in to the system. However, talk is available only if you access the shell with rlogin or telnet or the Communications Server, because it requires raw mode.

The typical format of the talk command is:

talk user_name

However, if a user is logged in more than once, you can specify terminal (in the form ttyp that who returns) rather than user_name.