stty man page on Gentoo

Man page or keyword search:  
man Server   6889 pages
apropos Keyword Search (all sections)
Output format
Gentoo logo
[printable version]

STTY(1P)		   POSIX Programmer's Manual		      STTY(1P)

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 operand...

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
       POSIX.1‐2008,  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 POSIX.1‐2008. 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
       POSIX.1‐2008, 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  Section
		 2.6, 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  Defini‐
		   tions  volume of POSIX.1‐2008, 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	 POSIX.1‐2008,
		   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 Defini‐
		   tions volume of POSIX.1‐2008, 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 set‐
		   ting the input and  output  termios	baud  rate  values  as
		   defined  in	the  Base  Definitions volume of POSIX.1‐2008,
		   Chapter 11, General Terminal Interface.

       ispeed number
		   Set terminal input baud rate to the number given, if possi‐
		   ble.	 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 POSIX.1‐2008, Chapter 11, General Terminal Inter‐
		   face.

       ospeed number
		   Set terminal output baud rate to the number given, if  pos‐
		   sible.  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	 POSIX.1‐2008,
		   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
		   POSIX.1‐2008, 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
		   POSIX.1‐2008, 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
		   POSIX.1‐2008, 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
		   POSIX.1‐2008, 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
		   POSIX.1‐2008, 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
		   POSIX.1‐2008, 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 POSIX.1‐2008, Chapter 11, General Terminal Inter‐
		   face.

       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
		   POSIX.1‐2008, 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
		   POSIX.1‐2008, 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 Defini‐
		   tions volume of POSIX.1‐2008, 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
		   POSIX.1‐2008, 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
		   POSIX.1‐2008, 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
		   POSIX.1‐2008, 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	 POSIX.1‐2008,
		   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
		   POSIX.1‐2008, 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	 POSIX.1‐2008,
		   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	 POSIX.1‐2008,
		   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
		   POSIX.1‐2008, 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
		   POSIX.1‐2008, 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  set‐
		   ting)  ONLRET  in  the termios c_oflag field, as defined in
		   the Base Definitions volume of  POSIX.1‐2008,  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 POSIX.1‐2008, Chapter 11, General Terminal Inter‐
		   face.

       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
		   POSIX.1‐2008, 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, respec‐
		   tively, in the termios c_oflag field,  as  defined  in  the
		   Base	 Definitions  volume of POSIX.1‐2008, Chapter 11, Gen‐
		   eral 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 POSIX.1‐2008, Chapter 11, General Terminal Inter‐
		   face.

       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 POSIX.1‐2008,
		   Chapter 11, General Terminal Interface.  Note that TAB3 has
		   the effect of expanding <tab> characters to <space> charac‐
		   ters.

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

       bs0 bs1	   Select the style of delay for <backspace> characters.  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 POSIX.1‐2008, Chapter 11,
		   General Terminal Interface.

       ff0 ff1	   Select the style of delay for <form-feed> characters.  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 POSIX.1‐2008, Chapter 11,
		   General Terminal Interface.

       vt0 vt1	   Select the style of delay  for  <vertical-tab>  characters.
		   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 POSIX.1‐2008, 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 POSIX.1‐2008, Chapter 11, General Terminal Inter‐
		   face.

       icanon (−icanon)
		   Enable  (disable)  canonical input (ERASE and KILL process‐
		   ing). This shall have the effect of setting	(not  setting)
		   ICANON in the termios c_lflag field, as defined in the Base
		   Definitions volume of  POSIX.1‐2008,	 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 set‐
		   ting) IEXTEN in the termios c_lflag field,  as  defined  in
		   the	Base  Definitions  volume of POSIX.1‐2008, 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 POSIX.1‐2008, Chapter 11, General Terminal Inter‐
		   face.

       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  set‐
		   ting) ECHOE in the termios c_lflag field, as defined in the
		   Base Definitions volume of POSIX.1‐2008, Chapter  11,  Gen‐
		   eral 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
		   POSIX.1‐2008, 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 POSIX.1‐2008, Chapter 11, General Terminal Inter‐
		   face.

       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 POSIX.1‐2008, Chapter 11, General Terminal Inter‐
		   face.

       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
		   POSIX.1‐2008, 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   the	 Base  Definitions  volume  of
	     POSIX.1‐2008, 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 POSIX.1‐2008,
	     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 corre‐
	     sponding 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 vari‐
		 ables that are unset or null. (See the Base Definitions  vol‐
		 ume  of POSIX.1‐2008, 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,
		 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  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
       POSIX.1‐2008.  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 charac‐
       ter  set	 is  now  specified  in	 the  Base   Definitions   volume   of
       POSIX.1‐2008,  Chapter  3,  Definitions,	 so  the historical mapping is
       specified. Note that although the mapping corresponds to	 control-char‐
       acter  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 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 POSIX.1‐2008.

FUTURE DIRECTIONS
       None.

SEE ALSO
       Chapter 2, Shell Command Language

       The  Base  Definitions  volume  of POSIX.1‐2008, Chapter 8, Environment
       Variables, Chapter 11, General Terminal Interface, Section 12.2,	 Util‐
       ity Syntax Guidelines, <termios.h>

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal  and	 Electronics  Engineers,  Inc  and  The	 Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum	 1  applied.)  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.unix.org/online.html .

       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,	 see  https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			      STTY(1P)
[top]

List of man pages available for Gentoo

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net