The /etc/ttytype file associates termcap/terminfo terminal type names
with tty lines. Each line consists of a terminal type, followed by whitespace,
followed by a tty name (a device name without the /dev/) prefix.
This association is used by the program tset(1) to set the environment
variable TERM to the default terminal name for the user's current tty.
This facility was designed for a traditional time-sharing environment featuring
character-cell terminals hardwired to a Unix minicomputer. It is little used
on modern workstation and personal Unixes.