4BSD/usr/man/cat4/newtty.4

NEWTTY(4)           UNIX Programmer's Manual            NEWTTY(4)



NAME
     newtty - summary of the ``new'' tty driver

SYNOPSIS
     stty new

     stty new crt

DESCRIPTION
     This is a summary of the new tty driver, described com-
     pletely, with the old terminal driver, in _t_t_y(4).  The new
     driver is largely compatible with the old but provides addi-
     tional 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 backwards between a `\' and an `/' character.

     Other terminal modes are possible, but less commonly used;
     see _t_t_y(4) and _s_t_t_y(1) for details.

     Input editing and output control.

     When preparing input the character # (normally changed to ^H
     using _s_t_t_y(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 gen-
     erates 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 _a_n_y character so that
     it may be entered without its special effect.  For backwards
     compatibility with the old tty driver the character `\'
     prevents the special meaning of the character and line erase
     characters, much as ^V does.



Printed 11/10/80                                                1






NEWTTY(4)           UNIX Programmer's Manual            NEWTTY(4)



     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 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 _s_t_t_y(1).  A quit
     ^\ character causes programs to terminate like ^? does, but
     also causes a _c_o_r_e 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 inter-
     rupts 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 con-
     trol mechanisms of the shell, i.e. the _f_g (foreground) com-
     mand.  The character ^Y is like ^Z but takes effect when
     read rather then when typed; it is much less frequently
     used.

     See _t_t_y(4) for a more complete description of the new termi-
     nal driver.

SEE ALSO
     csh(1), newcsh(1), stty(1), tty(4)


























Printed 11/10/80                                                2