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+stty(P) 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 operands. 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 commu-
+ nications 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 config-
+ ured to support the termios interface, some of the oper-
+ ands 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 terminal.
+
+ -g Write to standard output all the current settings
+ in an unspecified form that can be used as argu-
+ ments to another invocation of the stty utility
+ on the same system. The form used shall not con-
+ tain 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 set-
+ ting) 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, Chap-
+ ter 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 Termi-
+ nal 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 Termi-
+ nal 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, Gen-
+ eral 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 Termi-
+ nal 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 set-
+ ting) HUPCL in the termios c_cflag field, as
+ defined in the Base Definitions volume of
+ IEEE Std 1003.1-2001, Chapter 11, General Termi-
+ nal 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, Chap-
+ ter 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 Termi-
+ nal 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 set-
+ ting) IGNPAR in the termios c_iflag field, as
+ defined in the Base Definitions volume of
+ IEEE Std 1003.1-2001, Chapter 11, General Termi-
+ nal 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, Chap-
+ ter 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 Termi-
+ nal 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 Termi-
+ nal 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, Chap-
+ ter 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, Chap-
+ ter 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, Chap-
+ ter 11, General Terminal Interface.
+
+ ixon (-ixon)
+ Enable (disable) START/STOP output control. Out-
+ put 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 Ter-
+ minal 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, Chap-
+ ter 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 Termi-
+ nal 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, Chap-
+ ter 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, Chap-
+ ter 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, Chap-
+ ter 11, General Terminal Interface.
+
+ onlret (-onlret)
+ The terminal newline key performs (does not per-
+ form) 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 Definitions volume of
+ IEEE Std 1003.1-2001, Chapter 11, General Termi-
+ nal 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, Chap-
+ ter 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 Ter-
+ minal 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 Termi-
+ nal 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, Chap-
+ ter 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 Termi-
+ nal 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 Termi-
+ nal 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 Termi-
+ nal 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 Ter-
+ minal Interface.
+
+ icanon (-icanon)
+ Enable (disable) canonical input (ERASE and KILL
+ processing). This shall have the effect of set-
+ ting (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 Ter-
+ minal Interface.
+
+ iexten (-iexten)
+ Enable (disable) any implementation-defined spe-
+ cial control characters not currently 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, Chap-
+ ter 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 Termi-
+ nal 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, Chap-
+ ter 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 Termi-
+ nal Interface.
+
+ echonl (-echonl)
+ Echo (do not echo) NL, even if echo is disabled.
+ This shall have the effect of setting (not set-
+ ting) ECHONL in the termios c_lflag field, as
+ defined in the Base Definitions volume of
+ IEEE Std 1003.1-2001, Chapter 11, General Termi-
+ nal Interface.
+
+ noflsh (-noflsh)
+ Disable (enable) flush after INTR, QUIT, SUSP.
+ This shall have the effect of setting (not set-
+ ting) NOFLSH in the termios c_lflag field, as
+ defined in the Base Definitions volume of
+ IEEE Std 1003.1-2001, Chapter 11, General Termi-
+ nal 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 <con-
+ trol>-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 Termi-
+ nal 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 vol-
+ ume 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 sec-
+ ond 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 Charac-
+ ters 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 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 characteris-
+ tics.
+
+INPUT FILES
+ None.
+
+ENVIRONMENT VARIABLES
+ The following environment variables shall affect the
+ execution of stty:
+
+ LANG Provide a default value for the internationaliza-
+ tion variables that are unset or null. (See the
+ Base Definitions volume of IEEE Std 1003.1-2001,
+ Section 8.2, Internationalization Variables for
+ the precedence of internationalization variables
+ used to determine the values of locale cate-
+ gories.)
+
+ 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, single-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 mes-
+ sages 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 stan-
+ dard 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 infor-
+ mation 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 ter-
+ minal 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 char-
+ acters 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 success-
+ fully.
+
+ >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 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 ter-
+ minal driver termios.
+
+ Output modes are specified only for XSI-conformant sys-
+ tems. 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 pre-
+ ferred ERASE and KILL characters. As an application pro-
+ gramming 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 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 characters because the control characters were
+ not specified in the POSIX locale character set descrip-
+ tion 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 his-
+ torical 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
+ encodings.
+
+ Since termios supports separate speeds for input and
+ output, two new options were added to specify each dis-
+ tinctly.
+
+ Some historical implementations use standard input to
+ get and set terminal characteristics; others use stan-
+ dard output. Since input from a login TTY is usually
+ restricted to the owner while output to a TTY is fre-
+ quently 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 output to be redi-
+ rected 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 Operat-
+ ing System Interface (POSIX), The Open Group Base Speci-
+ fications Issue 6, Copyright (C) 2001-2003 by the Insti-
+ tute 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.open-
+ group.org/unix/online.html .
+
+
+
+POSIX 2003 stty(P)