GETTY(8) | System Manager's Manual | GETTY(8) |
getty
— set
terminal modes for system access
getty |
[type [tty]] |
The getty
program is called by
init(8) to open and initialize
the tty line, read a login name, and invoke
login(1). The devices on which
to run getty
are normally determined by
ttys(5).
The getty
program can also
recognize a Point to Point Protocol (PPP) negotiation, and, if the
pp attribute in
gettytab(5) is set, invoke
the program given by that string, e.g.,
pppd(8), instead of
login(1). This makes it
possible to use a single serial port for either a "shell" account
with command line interface, or a PPP network link.
The argument tty is the special device file
in /dev 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.-
The type argument can be used
to make getty
treat the terminal line specially.
This argument is used as an index into the
gettytab(5) database, to
determine the characteristics of the line. If there is no argument, or there
is no such table, the
default table is
used. If there is no /etc/gettytab a set of system
defaults is used. If indicated by the table located,
getty
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.
getty
uses the
ttyaction(3) facility with
an action of "getty" and user "root" to execute
site-specific commands when it starts.
Most of the default actions of getty
can
be circumvented, or modified, by a suitable
gettytab(5) table.
The getty
program 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.
login(1), ioctl(2), ttyaction(3), tty(4), gettytab(5), ttys(5), init(8), pppd(8)
A getty
program appeared in
Version 6 AT&T UNIX.
May 29, 2013 | NetBSD 10.99 |