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Linux 2.6 - man page for stty (linux section 1posix)

STTY(P) 			    POSIX Programmer's Manual				  STTY(P)

NAME
       stty - set the options for a terminal

SYNOPSIS
       stty [ -a| -g]

       stty operands

DESCRIPTION
       The  stty  utility shall set or report on terminal I/O characteristics for the device that
       is its standard input. Without options or operands specified, it shall report the settings
       of   certain  characteristics,  usually	those  that  differ  from  implementation-defined
       defaults. Otherwise, it shall modify the terminal state according to the  specified  oper-
       ands.  Detailed	information  about  the  modes	listed in the first five groups below are
       described in the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 11, General Ter-
       minal  Interface.  Operands  in	the  Combination Modes group (see Combination Modes ) are
       implemented using operands in the previous groups. Some combinations of operands are mutu-
       ally-exclusive on some terminal types; the results of using such combinations are unspeci-
       fied.

       Typical implementations of this utility require a communications line  configured  to  use
       the  termios interface defined in the System Interfaces volume of IEEE Std 1003.1-2001. On
       systems where none of these lines are available, and on lines not currently configured  to
       support	the termios interface, some of the operands need not affect terminal characteris-
       tics.

OPTIONS
       The stty utility shall conform to the Base  Definitions	volume	of  IEEE Std 1003.1-2001,
       Section 12.2, Utility Syntax Guidelines.

       The following options shall be supported:

       -a     Write to standard output all the current settings for the terminal.

       -g     Write  to  standard output all the current settings in an unspecified form that can
	      be used as arguments to another invocation of the stty utility on the same  system.
	      The  form used shall not contain any characters that would require quoting to avoid
	      word expansion by the shell; see Word Expansions .

OPERANDS
       The following operands shall be supported to set the terminal characteristics.

   Control Modes
       parenb  (-parenb)
	      Enable (disable) parity generation and detection. This shall  have  the  effect  of
	      setting  (not  setting) PARENB in the termios c_cflag field, as defined in the Base
	      Definitions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       parodd  (-parodd)

	      Select odd (even) parity. This shall have the effect of setting (not setting)  PAR-
	      ODD  in  the  termios  c_cflag  field, as defined in the Base Definitions volume of
	      IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       cs5 cs6 cs7 cs8
	      Select character size, if possible. This shall have the effect of setting CS5, CS6,
	      CS7,  and  CS8,  respectively, in the termios c_cflag field, as defined in the Base
	      Definitions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       number Set terminal baud rate to the number given, if possible. If the baud rate is set to
	      zero,  the  modem  control  lines  shall no longer be asserted. This shall have the
	      effect of setting the input and output termios baud rate values as defined  in  the
	      Base  Definitions  volume  of  IEEE Std 1003.1-2001,  Chapter  11, General Terminal
	      Interface.

       ispeed  number
	      Set terminal input baud rate to the number given, if possible. If  the  input  baud
	      rate  is	set  to  zero, the input baud rate shall be specified by the value of the
	      output baud rate. This shall have the effect of setting the input termios baud rate
	      values  as  defined in the Base Definitions volume of IEEE Std 1003.1-2001, Chapter
	      11, General Terminal Interface.

       ospeed  number
	      Set terminal output baud rate to the number given, if possible. If the output  baud
	      rate  is	set  to  zero,	the modem control lines shall no longer be asserted. This
	      shall have the effect of setting the output termios baud rate values as defined  in
	      the  Base  Definitions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal
	      Interface.

       hupcl  (-hupcl)
	      Stop asserting modem control lines (do not stop asserting modem control  lines)  on
	      last  close.  This  shall  have  the  effect  of setting (not setting) HUPCL in the
	      termios  c_cflag	field,	as  defined   in   the	 Base	Definitions   volume   of
	      IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       hup  (-hup)
	      Equivalent to hupcl( -hupcl).

       cstopb  (-cstopb)
	      Use  two	(one) stop bits per character. This shall have the effect of setting (not
	      setting) CSTOPB in the termios c_cflag field, as defined in  the	Base  Definitions
	      volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       cread  (-cread)
	      Enable  (disable) the receiver. This shall have the effect of setting (not setting)
	      CREAD in the termios c_cflag field, as defined in the Base  Definitions  volume  of
	      IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       clocal  (-clocal)
	      Assume  a  line without (with) modem control. This shall have the effect of setting
	      (not setting) CLOCAL in the termios c_cflag field, as defined in the  Base  Defini-
	      tions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       It  is  unspecified whether stty shall report an error if an attempt to set a Control Mode
       fails.

   Input Modes
       ignbrk  (-ignbrk)
	      Ignore (do not ignore) break on input. This shall have the effect of  setting  (not
	      setting)	IGNBRK	in  the termios c_iflag field, as defined in the Base Definitions
	      volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       brkint  (-brkint)
	      Signal (do not signal) INTR on break. This shall have the effect	of  setting  (not
	      setting)	BRKINT	in  the termios c_iflag field, as defined in the Base Definitions
	      volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       ignpar  (-ignpar)
	      Ignore (do not ignore) bytes with parity errors. This shall have the effect of set-
	      ting (not setting) IGNPAR in the termios c_iflag field, as defined in the Base Def-
	      initions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       parmrk  (-parmrk)

	      Mark (do not mark) parity errors. This shall have the effect of setting  (not  set-
	      ting)  PARMRK in the termios c_iflag field, as defined in the Base Definitions vol-
	      ume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       inpck  (-inpck)
	      Enable (disable) input parity checking. This shall have the effect of setting  (not
	      setting)	INPCK  in  the	termios c_iflag field, as defined in the Base Definitions
	      volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       istrip  (-istrip)
	      Strip (do not strip) input characters to seven bits. This shall have the effect  of
	      setting  (not  setting) ISTRIP in the termios c_iflag field, as defined in the Base
	      Definitions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       inlcr  (-inlcr)
	      Map (do not map) NL to CR on input. This shall have the effect of setting (not set-
	      ting) INLCR in the termios c_iflag field, as defined in the Base Definitions volume
	      of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       igncr (-igncr)
	      Ignore (do not ignore) CR on input. This shall have the effect of setting (not set-
	      ting) IGNCR in the termios c_iflag field, as defined in the Base Definitions volume
	      of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       icrnl  (-icrnl)
	      Map (do not map) CR to NL on input. This shall have the effect of setting (not set-
	      ting) ICRNL in the termios c_iflag field, as defined in the Base Definitions volume
	      of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       ixon  (-ixon)
	      Enable (disable) START/STOP output control. Output from the system is stopped  when
	      the  system  receives  STOP  and started when the system receives START. This shall
	      have the effect of setting (not setting) IXON in	the  termios  c_iflag  field,  as
	      defined in the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 11, General
	      Terminal Interface.

       ixany  (-ixany)
	      Allow any character to restart output. This shall have the effect of  setting  (not
	      setting)	IXANY  in  the	termios c_iflag field, as defined in the Base Definitions
	      volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       ixoff  (-ixoff)
	      Request that the system send (not send) STOP characters when  the  input	queue  is
	      nearly  full  and START characters to resume data transmission. This shall have the
	      effect of setting (not setting) IXOFF in the termios c_iflag field, as  defined  in
	      the  Base  Definitions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal
	      Interface.

   Output Modes
       opost  (-opost)
	      Post-process output (do not post-process output; ignore all  other  output  modes).
	      This  shall  have  the effect of setting (not setting) OPOST in the termios c_oflag
	      field, as defined in the Base Definitions volume of  IEEE Std 1003.1-2001,  Chapter
	      11, General Terminal Interface.

       ocrnl  (-ocrnl)
	      Map (do not map) CR to NL on output This shall have the effect of setting (not set-
	      ting) OCRNL in the termios c_oflag field, as defined in the Base Definitions volume
	      of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       onocr  (-onocr)
	      Do  not  (do)  output CR at column zero. This shall have the effect of setting (not
	      setting) ONOCR in the termios c_oflag field, as defined  in  the	Base  Definitions
	      volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       onlret  (-onlret)
	      The  terminal  newline key performs (does not perform) the CR function.  This shall
	      have the effect of setting (not setting) ONLRET in the termios  c_oflag  field,  as
	      defined in the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 11, General
	      Terminal Interface.

       ofill  (-ofill)
	      Use fill characters (use timing) for delays. This shall have the effect of  setting
	      (not  setting)  OFILL  in the termios c_oflag field, as defined in the Base Defini-
	      tions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       ofdel  (-ofdel)
	      Fill characters are DELs (NULs). This shall have the effect of  setting  (not  set-
	      ting) OFDEL in the termios c_oflag field, as defined in the Base Definitions volume
	      of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       cr0 cr1 cr2 cr3
	      Select the style of delay for CRs. This shall have the effect of setting	CRDLY  to
	      CR0,  CR1,  CR2,	or CR3, respectively, in the termios c_oflag field, as defined in
	      the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 11,	General  Terminal
	      Interface.

       nl0 nl1
	      Select  the  style  of delay for NL. This shall have the effect of setting NLDLY to
	      NL0 or NL1, respectively, in the termios c_oflag field, as defined in the Base Def-
	      initions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       tab0 tab1 tab2 tab3

	      Select  the  style of delay for horizontal tabs. This shall have the effect of set-
	      ting TABDLY to TAB0, TAB1, TAB2, or TAB3,  respectively,	in  the  termios  c_oflag
	      field,  as  defined in the Base Definitions volume of IEEE Std 1003.1-2001, Chapter
	      11, General Terminal Interface. Note that TAB3 has the effect of	expanding  <tab>s
	      to <space>s.

       tabs  (-tabs)
	      Synonym for tab0 ( tab3).

       bs0 bs1
	      Select  the  style  of  delay for backspaces. This shall have the effect of setting
	      BSDLY to BS0 or BS1, respectively, in the termios c_oflag field, as defined in  the
	      Base  Definitions  volume  of  IEEE Std 1003.1-2001,  Chapter  11, General Terminal
	      Interface.

       ff0 ff1
	      Select the style of delay for form-feeds. This shall have  the  effect  of  setting
	      FFDLY  to FF0 or FF1, respectively, in the termios c_oflag field, as defined in the
	      Base Definitions volume  of  IEEE Std 1003.1-2001,  Chapter  11,	General  Terminal
	      Interface.

       vt0 vt1
	      Select  the style of delay for vertical-tabs. This shall have the effect of setting
	      VTDLY to VT0 or VT1, respectively, in the termios c_oflag field, as defined in  the
	      Base  Definitions  volume  of  IEEE Std 1003.1-2001,  Chapter  11, General Terminal
	      Interface.

   Local Modes
       isig  (-isig)
	      Enable (disable) the checking of characters against the special control  characters
	      INTR,  QUIT,  and SUSP. This shall have the effect of setting (not setting) ISIG in
	      the  termios  c_lflag  field,  as  defined  in  the  Base  Definitions  volume   of
	      IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       icanon  (-icanon)
	      Enable  (disable)  canonical input (ERASE and KILL processing). This shall have the
	      effect of setting (not setting) ICANON in the termios c_lflag field, as defined  in
	      the  Base  Definitions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal
	      Interface.

       iexten  (-iexten)
	      Enable (disable) any implementation-defined special  control  characters	not  cur-
	      rently  controlled  by  icanon, isig, ixon, or ixoff. This shall have the effect of
	      setting (not setting) IEXTEN in the termios c_lflag field, as defined in	the  Base
	      Definitions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       echo  (-echo)
	      Echo  back  (do not echo back) every character typed. This shall have the effect of
	      setting (not setting) ECHO in the termios c_lflag field, as  defined  in	the  Base
	      Definitions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       echoe  (-echoe)
	      The ERASE character visually erases (does not erase) the last character in the cur-
	      rent line from the display, if possible. This shall have the effect of setting (not
	      setting)	ECHOE  in  the	termios c_lflag field, as defined in the Base Definitions
	      volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       echok  (-echok)
	      Echo (do not echo) NL after KILL character. This shall have the effect  of  setting
	      (not  setting)  ECHOK  in the termios c_lflag field, as defined in the Base Defini-
	      tions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       echonl  (-echonl)
	      Echo (do not echo) NL, even if echo is disabled. This shall have the effect of set-
	      ting (not setting) ECHONL in the termios c_lflag field, as defined in the Base Def-
	      initions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       noflsh  (-noflsh)
	      Disable (enable) flush after INTR, QUIT, SUSP. This shall have the effect  of  set-
	      ting (not setting) NOFLSH in the termios c_lflag field, as defined in the Base Def-
	      initions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

       tostop  (-tostop)
	      Send SIGTTOU for background output. This shall have the effect of setting (not set-
	      ting)  TOSTOP in the termios c_lflag field, as defined in the Base Definitions vol-
	      ume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface.

   Special Control Character Assignments
       <control>-character string

	      Set <control>-character to string. If <control>-character is one of  the	character
	      sequences  in the first column of the following table, the corresponding Base Defi-
	      nitions volume of IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface con-
	      trol  character  from the second column shall be recognized. This has the effect of
	      setting the corresponding element of the termios c_cc array (see the  Base  Defini-
	      tions volume of IEEE Std 1003.1-2001, Chapter 13, Headers, <termios.h>).

				    Table: Control Character Names in stty

			      Control Character  c_cc Subscript  Description
			      eof		 VEOF		 EOF character
			      eol		 VEOL		 EOL character
			      erase		 VERASE 	 ERASE character
			      intr		 VINTR		 INTR character
			      kill		 VKILL		 KILL character
			      quit		 VQUIT		 QUIT character
			      susp		 VSUSP		 SUSP character
			      start		 VSTART 	 START character
			      stop		 VSTOP		 STOP character

       If  string is a single character, the control character shall be set to that character. If
       string is the two-character sequence "^-" or the string undef, the control character shall
       be  set	to _POSIX_VDISABLE , if it is in effect for the device; if _POSIX_VDISABLE is not
       in effect for the device, it shall be treated as an error. In the POSIX locale, if  string
       is a two-character sequence beginning with circumflex ( '^' ), and the second character is
       one of those listed in the "^c" column of the following table, the control character shall
       be set to the corresponding character value in the Value column of the table.

			      Table: Circumflex Control Characters in stty

			       ^c     Value   ^c     Value   ^c     Value
			       a, A   <SOH>   l, L   <FF>    w, W   <ETB>
			       b, B   <STX>   m, M   <CR>    x, X   <CAN>
			       c, C   <ETX>   n, N   <SO>    y, Y   <EM>
			       d, D   <EOT>   o, O   <SI>    z, Z   <SUB>
			       e, E   <ENQ>   p, P   <DLE>   [	    <ESC>
			       f, F   <ACK>   q, Q   <DC1>   \	    <FS>
			       g, G   <BEL>   r, R   <DC2>   ]	    <GS>
			       h, H   <BS>    s, S   <DC3>   ^	    <RS>
			       i, I   <HT>    t, T   <DC4> -------- <US>
			       j, J   <LF>    u, U   <NAK>   ?	    <DEL>
			       k, K   <VT>    v, V   <SYN>

       min  number

	      Set  the value of MIN to number. MIN is used in non-canonical mode input processing
	      ( icanon).

       time  number

	      Set the value of TIME to number. TIME is used in non-canonical mode input  process-
	      ing ( icanon).

   Combination Modes
       saved settings

	      Set  the	current terminal characteristics to the saved settings produced by the -g
	      option.

       evenp or parity

	      Enable parenb and cs7; disable parodd.

       oddp

	      Enable parenb, cs7, and parodd.

       -parity, -evenp, or -oddp

	      Disable parenb, and set cs8.

       raw  (-raw or cooked)

	      Enable (disable) raw input and output. Raw mode shall be equivalent to setting:

	      stty cs8 erase ^- kill ^- intr ^- \
		  quit ^- eof ^- eol ^- -post -inpck

       nl  (-nl)

	      Disable (enable) icrnl. In addition, -nl unsets inlcr and igncr.

       ek     Reset ERASE and KILL characters back to system defaults.

       sane

	      Reset all modes to some reasonable, unspecified, values.

STDIN
       Although no input is read from standard input, standard input shall be  used  to  get  the
       current terminal I/O characteristics and to set new terminal I/O characteristics.

INPUT FILES
       None.

ENVIRONMENT VARIABLES
       The following environment variables shall affect the execution of stty:

       LANG   Provide  a  default  value for the internationalization variables that are unset or
	      null. (See the Base Definitions volume of IEEE Std 1003.1-2001, Section 8.2, Inter-
	      nationalization Variables for the precedence of internationalization variables used
	      to determine the values of locale categories.)

       LC_ALL If set to a non-empty string value, override the values of all the  other  interna-
	      tionalization variables.

       LC_CTYPE
	      This variable determines the locale for the interpretation of sequences of bytes of
	      text data as characters (for example, single-byte as opposed to multi-byte  charac-
	      ters in arguments) and which characters are in the class print.

       LC_MESSAGES
	      Determine the locale that should be used to affect the format and contents of diag-
	      nostic messages written to standard error.

       NLSPATH
	      Determine the location of message catalogs for the processing of LC_MESSAGES .

ASYNCHRONOUS EVENTS
       Default.

STDOUT
       If operands are specified, no output shall be produced.

       If the -g option is specified, stty shall write to standard output the current settings in
       a form that can be used as arguments to another instance of stty on the same system.

       If the -a option is specified, all of the information as described in the OPERANDS section
       shall be written to standard output. Unless otherwise specified, this information shall be
       written	as  <space>-separated tokens in an unspecified format, on one or more lines, with
       an unspecified number of tokens per line.  Additional information may be written.

       If no options or operands are specified, an unspecified subset of the information  written
       for the -a option shall be written.

       If  speed  information  is  written  as part of the default output, or if the -a option is
       specified and if the terminal input speed and output speed are the same, the speed  infor-
       mation shall be written as follows:

	      "speed %d baud;", <speed>

       Otherwise, speeds shall be written as:

	      "ispeed %d baud; ospeed %d baud;", <ispeed>, <ospeed>

       In  locales  other  than  the POSIX locale, the word baud may be changed to something more
       appropriate in those locales.

       If control characters are written as part of the default output, or if the  -a  option  is
       specified, control characters shall be written as:

	      "%s = %s;", <control-character name>, <value>

       where  <value>  is either the character, or some visual representation of the character if
       it is non-printable, or the string undef if the character is disabled.

STDERR
       The standard error shall be used only for diagnostic messages.

OUTPUT FILES
       None.

EXTENDED DESCRIPTION
       None.

EXIT STATUS
       The following exit values shall be returned:

	0     The terminal options were read or set successfully.

       >0     An error occurred.

CONSEQUENCES OF ERRORS
       Default.

       The following sections are informative.

APPLICATION USAGE
       The -g flag is designed to facilitate the saving and restoring of terminal state from  the
       shell level. For example, a program may:

	      saveterm="$(stty -g)"	  # save terminal state
	      stty (new settings)	  # set new state
	      ...			  # ...
	      stty $saveterm		  # restore terminal state

       Since the format is unspecified, the saved value is not portable across systems.

       Since  the  -a format is so loosely specified, scripts that save and restore terminal set-
       tings should use the -g option.

EXAMPLES
       None.

RATIONALE
       The original stty description was taken directly from System V and reflected the System	V
       terminal  driver  termio.   It  has  been  modified  to	correspond to the terminal driver
       termios.

       Output modes are specified  only  for  XSI-conformant  systems.	All  implementations  are
       expected to provide stty operands corresponding to all of the output modes they support.

       The  stty  utility is primarily used to tailor the user interface of the terminal, such as
       selecting the preferred ERASE and KILL characters. As an application programming  utility,
       stty  can  be used within shell scripts to alter the terminal settings for the duration of
       the script.

       The termios section states that individual disabling of	control  characters  is  possible
       through the option _POSIX_VDISABLE. If enabled, two conventions currently exist for speci-
       fying this: System V uses "^-" , and BSD uses undef. Both are accepted  by  stty  in  this
       volume  of  IEEE Std 1003.1-2001.   The	other  BSD convention of using the letter 'u' was
       rejected because it conflicts with the actual letter 'u' , which is  an	acceptable  value
       for a control character.

       Early proposals did not specify the mapping of "^c" to control characters because the con-
       trol characters were not specified in the POSIX	locale	character  set	description  file
       requirements.   The  control character set is now specified in the Base Definitions volume
       of IEEE Std 1003.1-2001, Chapter 3, Definitions so the historical  mapping  is  specified.
       Note  that  although  the mapping corresponds to control-character key assignments on many
       terminals that use the ISO/IEC 646:1991 standard (or ASCII) character encodings, the  map-
       ping specified here is to the control characters, not their keyboard encodings.

       Since termios supports separate speeds for input and output, two new options were added to
       specify each distinctly.

       Some historical implementations use standard input to get and  set  terminal  characteris-
       tics;  others  use  standard output. Since input from a login TTY is usually restricted to
       the owner while output to a TTY is frequently open to anyone, using  standard  input  pro-
       vides  fewer  chances  of  accidentally (or maliciously) altering the terminal settings of
       other users. Using standard input also allows stty -a and stty -g output to be  redirected
       for  later  use.  Therefore,  usage  of	standard  input  is  required  by  this volume of
       IEEE Std 1003.1-2001.

FUTURE DIRECTIONS
       None.

SEE ALSO
       Shell Command Language , the Base Definitions volume of IEEE Std 1003.1-2001, Chapter  11,
       General Terminal Interface, <termios.h>

COPYRIGHT
       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					  STTY(P)


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