# 2.11BSD#431 - /usr/man/cat1/stty.0

    STTY(1)             UNIX Programmer's Manual		  STTY(1)

    NAME
         stty - set terminal options

    SYNOPSIS
         stty [-a | -e] [-f file] [operands]

    DESCRIPTION
         Stty sets certain I/O options on the current output termi-
         nal, placing its output on the diagnostic output.	With no
         argument, it reports the speed of the terminal and the set-
         tings of the options which are different from their
         defaults.

         The following options are available:

         -a        Display everything stty knows.  This has the same
    	       effect as using the operand all or everything.
    	       The distinction between all and everything has
    	       been removed.

         -e        Same a -a above.

         -f        Open and use the terminal named by file rather
    	       than using standard output.  The file is opened
    	       using the O_NONBLOCK flag of open(), making it
    	       possible to set or display settings on a terminal
    	       that might otherwise block on the open.

         The following operands are special:

         all	 Everything stty knows about is printed.

         everything  Same as all above.

         flushout	 Flush the queues for the device.  This is most
    		 useful when an exiting process is stuck waiting
    		 for terminal output to drain.

         speed	 The terminal speed alone is printed on the stan-
    		 dard output.

         size	 The terminal (window) sizes are printed on the
    		 standard output, first rows and then columns.

         Operands are selected from the following:

         even      allow even parity input
         -even     disallow even parity input

         odd       allow odd parity input
         -odd      disallow odd parity input

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    STTY(1)             UNIX Programmer's Manual		  STTY(1)

         raw       raw mode input (no input processing (erase, kill,
    	       interrupt, ...); parity bit passed back)
         -raw      negate raw mode

         cooked    same as `-raw'

         cbreak    make each character available to read(2) as
    	       received; no erase and kill processing, but all
    	       other processing (interrupt, suspend, ...) is per-
    	       formed
         -cbreak   make characters available to read only when new-
    	       line is received

         -nl       allow carriage return for new-line, and output
    	       CR-LF for carriage return or new-line
         nl        accept only new-line to end lines

         echo      echo back every character typed
         -echo     do not echo characters

         tandem    enable inbound software (xon/xoff) flow control,
    	       so that the system sends out the stop character
    	       when its internal queue is in danger of overflow-
    	       ing on input, and sends the start character when
    	       it is ready to accept further input
         -tandem   disable inbound software (xon/xoff) flow control

         -tabs     replace tabs by spaces when printing
         tabs      preserve tabs

         For the following commands which take a character argument
         c, you may also specify c as ``undef'', to set the value to
         be undefined.  A value of ``^x'', a 2 character sequence, is
         also interpreted as a control character, with ``^?''
         representing delete.

         erase c   set erase character to c (default `#', but often
    	       reset to ^H.)
         kill c    set kill character to c (default `@', but often
    	       reset to ^U.)
         intr c    set interrupt character to c (default DEL or ^?
    	       (delete), but often reset to ^C.)
         quit c    set quit character to c (default control \.)
         start c   set start character to c (default control Q.)
         stop c    set stop character to c (default control S.)
         eof c     set end of file character to c (default control
    	       D.)
         brk c     set break character to c (default undefined.) This
    	       character is an additional character causing
    	       wakeup.
         dec       set all modes suitable for Digital Equipment Corp.
    	       operating systems users; (erase, kill, and

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    STTY(1)             UNIX Programmer's Manual		  STTY(1)

    	       interrupt characters to ^?, ^U, and ^C, decctlq
    	       and ``newcrt''.)

         0	       hang up phone line immediately
         50 75 110 134 150 200 300 600 1200 1800 2400 4800 9600 exta extb
    	       Set terminal baud rate to the number given, if
    	       possible.  (These are the speeds supported by the
    	       DH-11 interface).

         rows n    The terminal size is recorded as having n rows.

         columns n The terminal size is recorded as having n columns.

         cols n    is an alias for columns.

         A teletype driver which supports the job control processing
         of csh(1) and more functionality than the basic driver is
         fully described in tty(4).  The following options apply only
         to it.

         new       Use new driver (switching flushes typeahead).
         crt       Set options for a CRT (crtbs, ctlecho and, if >=
    	       1200 baud, crterase and crtkill.)

         crtbs     Echo backspaces on erase characters.

         prterase  For printing terminal echo erased characters back-
    	       wards within ``\'' and ``/''.

         crterase  Wipe out erased characters with ``backspace-
    	       space-backspace.''
         -crterase Leave erased characters visible; just backspace.

         crtkill   Wipe out input on like kill ala crterase.
         -crtkill  Just echo line kill character and a newline on
    	       line kill.

         ctlecho   Echo control characters as ``^x'' (and delete as
    	       ``^?''.) Print two backspaces following the EOT
    	       character (control D).
         -ctlecho  Control characters echo as themselves; in cooked
    	       mode EOT (control-D) is not echoed.

         decctlq   After output is suspended (normally by ^S), only a
    	       start character (normally ^Q) will restart it.
    	       This is compatible with DEC's vendor supplied sys-
    	       tems.
         -decctlq  After output is suspended, any character typed
    	       will restart it; the start character will restart
    	       output without providing any input.  (This is the
    	       default.)

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    STTY(1)             UNIX Programmer's Manual		  STTY(1)

         tostop    Background jobs stop if they attempt terminal out-
    	       put.
         -tostop   Output from background jobs to the terminal is
    	       allowed.

         flusho    Output is being discarded usually because user hit
    	       control O (internal state bit).
         -flusho   Output is not being discarded.

         pendin    Input is pending after a switch from cbreak to
    	       cooked and will be re-input when a read becomes
    	       pending or more input arrives (internal state
    	       bit).
         -pendin   Input is not pending.

         pass8     Passes all 8 bits through on input, in any mode.
         -pass8    Strips the 0200 bit on input except in raw mode.

         mdmbuf    Start/stop output on carrier transitions (not
    	       implemented).
         -mdmbuf   Return error if write attempted after carrier
    	       drops.

         litout    Send output characters without any processing.
         -litout   Do normal output processing, inserting delays,
    	       etc.

         nohang    Don't send hangup signal if carrier drops.
         -nohang   Send hangup signal to control process group when
    	       carrier drops.

         The following special characters are applicable only to the
         new teletype driver and are not normally changed.

         susp c    set suspend process character to c (default con-
    	       trol Z).
         dsusp c   set delayed suspend process character to c
    	       (default control Y).
         rprnt c   set reprint line character to c (default control
    	       R).
         flush c   set flush output character to c (default control
    	       O).
         werase c  set word erase character to c (default control W).
         lnext c   set literal next character to c (default control
    	       V).

         Modem Control Status:

         These display the current state of modem control.	They are
         only displayed for actual tty lines and not for pseudo tty
         lines (more precisely, it is only displayed for lines which
         support the TIOCMGET ioctl.  See tty(4).

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    STTY(1)             UNIX Programmer's Manual		  STTY(1)

         While it is possible to change the state of the modem con-
         trol lines, the hardware or other software may prevent the
         change from actually taking place, or may cause the state to
         immediately revert to the original state.

         dcd (-dcd)     State of Data Carrier Detect.

         dsr (-dsr)     State of Data Set Ready.

         dtr (-dtr)     State of Data Terminal Ready.

         cts (-cts)     State of Clear To Send.

         rts (-rts)     State of Request To Send.

    SEE ALSO
         ioctl(2), tabs(1), tset(1), tty(4)

    Printed 11/24/99	 March 27, 1997                         5

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