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

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

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. Other‐
       wise, it shall modify the terminal state according to the specified op‐
       erands.	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 Terminal Interface. Operands
       in the Combination Modes group (see Combination Modes ) are implemented
       using  operands	in  the previous groups. Some combinations of operands
       are mutually-exclusive on some terminal types;  the  results  of	 using
       such combinations are unspecified.

       Typical	implementations	 of this utility require a communications line
       configured to use the termios interface defined in  the	System	Inter‐
       faces  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
       characteristics.

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 termi‐
	      nal.

       -g     Write to standard output all the current settings in an unspeci‐
	      fied 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  charac‐
       teristics.

   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) PARODD 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  set‐
	      ting  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 set‐
	      ting  (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  Definitions  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  setting  (not  setting)  IGNPAR  in  the  termios
	      c_iflag  field,  as  defined  in	the Base Definitions 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  setting)  PARMRK in the termios c_iflag field, as
	      defined in the Base Definitions volume 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 setting) 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 setting) 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 setting) 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 sys‐
	      tem  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  set‐
	      ting) 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 setting) 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 Def‐
	      initions 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  Definitions  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  setting)  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  Definitions  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 setting 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 currently controlled by icanon,  isig,  ixon,  or
	      ixoff.  This shall have the effect of setting (not setting) IEX‐
	      TEN in the termios c_lflag field, as defined in the Base Defini‐
	      tions volume of IEEE Std 1003.1-2001, Chapter 11, General Termi‐
	      nal 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 current 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  Definitions  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  setting	(not  setting)	ECHONL	in the termios
	      c_lflag field, as defined in  the	 Base  Definitions  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  setting  (not  setting)  NOFLSH  in  the  termios
	      c_lflag  field,  as  defined  in	the Base Definitions 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 setting) TOSTOP in the termios c_lflag field, as
	      defined in the Base Definitions volume 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   Definitions   volume   of
	      IEEE Std 1003.1-2001, Chapter  11,  General  Terminal  Interface
	      control  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  Definitions  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 cor‐
       responding 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 processing ( 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 equiva‐
	      lent 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,  Internationalization	 Vari‐
	      ables  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 internationalization variables.

       LC_CTYPE
	      This  variable  determines  the locale for the interpretation of
	      sequences of bytes of text data as characters (for example, sin‐
	      gle-byte	as  opposed to multi-byte characters 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 diagnostic 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 other‐
       wise specified, this information shall be written as  <space>-separated
       tokens in an unspecified format, on one or more lines, with an unspeci‐
       fied 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 information 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	 char‐
       acter 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 ter‐
       minal 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 settings 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	imple‐
       mentations  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 charac‐
       ters is possible through the option _POSIX_VDISABLE.  If	 enabled,  two
       conventions  currently  exist for specifying 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 charac‐
       ters because the control characters were not  specified	in  the	 POSIX
       locale  character set description file requirements.  The control char‐
       acter  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  mapping
       specified  here is to the control characters, not their keyboard encod‐
       ings.

       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 ter‐
       minal characteristics; 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 provides fewer  chances
       of  accidentally	 (or  maliciously)  altering  the terminal settings of
       other users. Using standard input also allows stty -a and stty -g  out‐
       put  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 original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			       STTY(P)
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