GETTY(8) | System Manager's Manual | GETTY(8) |
getty
, uugetty
—
getty |
[type [tty]] |
uugetty |
[type [tty]] |
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.
The uugetty
program is the same, except
that it uses pidlock(3) to
respect the locks in /var/spool/lock of processes
that dial out on that tty.
getty
program appeared in
Version 6 AT&T UNIX.
May 29, 2013 | NetBSD 9.4 |