NEWTTY(4) GENIX Programmer's Manual NEWTTY(4)
NAME
newtty - summary of the ``new'' tty driver
USAGE
stty new
stty new crt
DESCRIPTION
This is a summary of the new tty driver, described completely, with
the old terminal driver, in tty(4). The new driver is largely com-
patible with the old but provides additional functionality for job
control.
CRTs and printing terminals.
The new terminal driver acts differently on CRTs and on printing
terminals. On CRTs at speeds of 1200 baud or greater it normally
erases input characters physically with backspace-space-backspace
when they are erased logically; at speed under 1200 baud this is
often unreasonably slow, so the cursor is normally merely moved to
the left. This is the behavior when you say "stty new crt"; to have
the tty driver always erase the characters say "stty new crt
crterase crtkill", to have the characters remain even at 1200 baud
or greater say "stty new crt -crterase -crtkill".
On printing terminals the command "stty new prterase" should be
given. Logically erased characters are then echoed printed back-
wards between a `\' and an `/' character.
Other terminal modes are possible, but less commonly used; see
tty(4) and stty(1) for details.
Input editing and output control.
When preparing input the character # (normally changed to ^H using
stty(1)) erases the last input character, ^W the last input word,
and the character @ (often changed to ^U) erases the entire current
input line. A ^R character causes the pending input to be retyped.
Lines are terminated by a return or a newline; a ^D at the beginning
of a line generates an end-of-file.
Control characters echo as ^x when typed, for some x; the delete
character is represented as ^?.
The character ^V may be typed before any character so that it may be
entered without its special effect. For backwards compatibility
with the old tty driver the character `\' prevents the special mean-
ing of the character and line erase characters, much as ^V does.
Output is suspended when a ^S character is typed and resumed when a
^Q character is type. Output is discarded after a ^O character is
Printed 11/16/83 1
NEWTTY(4) GENIX Programmer's Manual NEWTTY(4)
typed until another ^O is type, more input arrives, or the condition
is cleared by a program (such as the shell just before it prints a
prompt.)
Signals.
A non-interactive program is interrupted by a ^? (delete); this
character is often reset to ^C using stty(1). A quit ^\ character
causes programs to terminate like ^? does, but also causes a core
image file to be created which can then be examined with a debugger.
This is often used to stop runaway processes. Interactive programs
often catch interrupts and return to their command loop; only the
most well debugged programs catch quits.
Programs may be stopped by hitting ^Z, which returns control to the
shell. They may then be resumed using the job control mechanisms of
the shell, i.e. the fg (foreground) command. The character ^Y is
like ^Z but takes effect when read rather then when typed; it is
much less frequently used.
See tty(4) for a more complete description of the new terminal
driver.
SEE ALSO
csh(1), newcsh(1), stty(1), tty(4)
Printed 11/16/83 2