utility is called by
to open and initialize the tty line, read a login name, and invoke
is the special device file in
to open for the terminal (for example, ttyh0).
If there is no argument or the argument is
the tty line is assumed to be open as file descriptor 0.
argument can be used to make
treat the terminal line specially.
This argument is used as an index into the
database, to determine the characteristics of the line.
If there is no argument, or there is no such table, the
table is used.
If there is no
a set of system defaults is used.
If indicated by the table located,
will clear the terminal screen,
print a banner heading,
and prompt for a login name.
Usually either the banner or the login prompt will include
the system hostname.
Most of the default actions of
can be circumvented, or modified, by a suitable
utility can be set to timeout after some interval,
which will cause dial up lines to hang up
if the login name is not entered reasonably quickly.