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stty(1) General Commands Manual stty(1) NAME stty - Sets terminal characteristics SYNOPSIS stty [-a|-g] [-f special-device] stty [-f special-device] [argument...] STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: stty: XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. OPTIONS Writes to standard output all the current settings for the terminal. [DIGITAL] Allows you to specify an alternate terminal or teletype de- vice. Normally, the stty command works on standard input. Writes to standard output the current settings in an unspecified form that can be used as arguments to another stty utility on the same system. DESCRIPTION The stty utility sets or reports on terminal I/O characteristics for the device that is its standard input. Without options or arguments specified, stty reports the settings of certain characteristics, usually those that differ from implementation- defined defaults; otherwise, stty modifies the terminal state according to the specified arguments. Some combinations of arguments are mutu- ally exclusive on some terminal types. Sections marked with (I18N) describe features that are available when: The DIGITAL UNIX optional subsets for Asian country support are in- stalled on your system. The Asian or Thai terminal interface has been enabled. Control Modes The following arguments are available to set the terminal characteris- tics: Enables (disables) parity generation and detection. Selects odd (even) parity. Selects character size, if possible. Sets terminal baud rate to the number given, if possible. If the baud rate is set to zero, modem control is no longer asserted. Sets terminal input baud rate to the number given, if possible. If zero is specified, the input baud rate is set to be the same as the output baud rate. Sets terminal output baud rate to the number given, if possible. If the output baud rate is set to zero, modem control is no longer asserted. Stops as- serting modem control (does not stop asserting modem control) on last close. Same as hupcl (-hupcl). Uses two (one) stop bits per charac- ter. Enables (disables) the receiver. Assumes a line without (with) modem control. [DIGITAL] Enables (disables) hardware flow control us- ing the Request to Send (RTS) and Clear to Send (CTS) signals. [DIGI- TAL] Disables (enables) the printing of kernel-generated status infor- mation when the info control character is entered. Input Modes [DIGITAL] Echoes control characters as ^X and <Delete> as ^?. Prints two backspaces following the End-of-File character. (Special charac- ters are echoed as themselves.) Ignores (does not ignore) break on in- put. Signals (does not signal) INTR on break. Ignores (does not ig- nore) parity errors. Marks (does not mark) parity errors. Enables (disables) input parity checking. Strips (does not strip) input char- acters to seven bits. Maps (does not map) newline to carriage-return on input. Ignores (does not ignore) carriage-return on input. Maps (does not map) carriage-return to newline on input. [DIGITAL] Does (does not) ring bell on terminal when input buffer is full. Maps (does not map) uppercase alphabetic characters to lowercase. Enables (dis- ables) Start/Stop output control. Output from the system is stopped when the system receives Stop and started when the system receives Start. Allows any character (allows only <Ctrl-q>) to restart output. Requests that the system send (not send) Start/Stop characters when the input queue is nearly empty/full. Output Modes Post-processes output (does not post-process output; ignores all other output modes). Maps (does not map) lowercase alphabetic characters to uppercase on output. [DIGITAL] Discards (keeps) End-of-Text on out- put. [DIGITAL] Maps (does not map) newline characters to carriage-re- turn/newline characters. Maps (does not map) carriage-return/newline characters to newline characters. Does not (does) output carriage-re- turn characters at column 0 (zero). Causes (does not cause) newline to perform the carriage-return function on the terminal. Uses fill char- acters (uses timing) for delays. Uses Delete (uses Null) characters for fill characters. [DIGITAL] Maintains (expands to spaces) any tab characters in the output. Selects style of delay for carriage-return characters. Selects style of delay for newline characters. Selects style of delay for horizontal tabs. Selects style of delay for back- spaces. Selects style of delay for form feeds. Selects style of delay for vertical tabs. [DIGITAL] Specifies the number of lines this dis- play can hold. [DIGITAL] Specifies the number of characters per dis- play line. Local Modes [DIGITAL] Uses (does not use) the altwerase mode, which defines a word as containing only alphanumeric characters and _ (underscore). Enables (disables) the checking of characters against the special control char- acters INTR, QUIT, and SUSP. Enables (disables) canonical input (Erase and Kill processing). [DIGITAL] Echoes (does not echo) the Kill char- acter by erasing the line in place like echoe. [DIGITAL] Uses (does not use) carrier as a flow control flag rather than sending a HANGUP signal. [DIGITAL] Prints (does not print) erased characters backwards within \ (backslash) and / (slash). Stops (allows) output from back- ground jobs to the terminal. [DIGITAL] Echoes (does not echo) upper- case characters on input, and displays uppercase characters on output with a preceding \ (backslash). Enables (disables) any implementation- defined special control-characters not currently controlled by icanon, isig, or ixon. Echoes back (does not echo back) every character typed. Causes the Erase character to (to not) visually erase the last charac- ter in the current line from the display, if possible. Echoes (does not echo) newline after the Kill character. Echoes (does not echo) newline, even if echo is disabled. Disables (enables) flush after INTR, QUIT, SUSP. Control Assignments Sets special-character to string. The special character is set to the first character in string and subsequent characters are ignored, with the following exceptions: The strings undef and ^- set the special character to {_POSIX_VDISABLE} if it is in effect for the device. The string ^? sets the special character to <Delete>. Any other string beginning with the character ^ sets the special character to the con- trol character corresponding to the second character of string (subse- quent characters are ignored). For example, the string ^c sets the special character to ^C; the string ^zq sets the special character to ^Z. Note that you can set a special character to a control character in two ways: by entering the control character itself or by en- tering ^ and another character. This allows you to enter a con- trol characters that is already assigned to a special character without entering that special character; for example, you can enter ^C, even if it is already assigned to the intr special character, by entering ^ and then c. Recognized special-characters include dsusp, eof, eol, eol2, erase, discard, status, intr, kill, lnext, quit, reprint, start, stop, susp, and werase. Sets the current terminal characteris- tics to the saved settings produced by the -g option. Sets the value of min or time to number. MIN and TIME are used in Non- Canonical mode input processing (-icanon). Sets the line disci- pline to the specified number. Combination Modes Enables parenb and cs7; disables parodd. Enables parenb, cs7, and par- odd. Disables parenb, and sets cs8. Enables (disables) raw input and output (no ERASE, KILL, INTR, QUIT, EOT, or output processing). En- ables (disables) icrnl and onlcr. The -nl mode also unsets inlcr, igncr ocrnl, and onlret. Sets (unsets) xcase, iuclc, and olcuc. (Used for terminals with uppercase characters only.) Resets all modes to some reasonable values. Asian Line Discipline Setup (I18N) Sets the current line discipline to Asian and sets up the processing environment for Asian codesets other than those for Japanese. The ap- plication code is set to the codeset defined in the current locale. The terminal code may also be set to the same codeset when not defined. Sets the current line discipline to Asian and sets up the processing environment for Japanese codesets. Terminal code is always be set to dec, but the application code depends on the current local setting. If a valid Japanese codeset is found in the current locale, the applica- tion code is set to that codeset. Otherwise, the application code is set to eucJP. Modes for Terminal and Application Code (I18N) Sets the application code to codeset. Sets the terminal code to code- set. Sets both the terminal code and the application code to codeset. Enables (disables) codeset conversion between the internal code and the application and terminal codes. Codeset conversion must be enabled in order for Asian terminal features to work. Codeset conversion should be disabled only under certain circumstances that do not allow modifi- cation of data passing through the terminal lines. One such circum- stance would be running an 8-bit binary file transfer protocol, such as kermit and sz (zmodem). Japanese Input Modes (I18N) Sets the input mode for 8-bit code or Hankaku Kana code from the termi- nal. The following keywords can be used for the mode argument: The 8-bit code from the terminal is treated as a part of the Kanji code when the terminal code is set to dec. The 8-bit code (when terminal code is dec) or the Hankaku Kana code from the terminal is converted to the 16-bit Hiragana code. The 8-bit code (when terminal code is dec) or the Hankaku Kana code from the terminal is converted to the 16-bit Katakana code. The 8-bit code (when terminal code is dec) or the Han- kaku Kana code from the terminal is converted to the 8-bit Hankaku Kana code. Enables (disables) the Japanese input method. The Kana-Kanji conversion daemon, kkcd, is spawned (ikk) or killed (-ikk). The kkseq key map information is derived from the following (in priority order): The file specified by the JSYKKSEQ environment variable The ~/.jsykkseq file Dictionary names are derived from the following (in priority or- der): The files specified by the JSYTANGO, JSYKOJIN, and JSYLEARN environment variables The /usr/i18n/jsy/jsytango.dic, ~/jsykojin.dic, and ~/.jsylearn files. Sets the JIS Kanji shift-in escape sequence for the JIS terminal. Sets the JIS Kanji shift-out escape sequence for the JIS terminal. Sets the character attribute used to mark a clause that is the result of the Kana-Kanji conversion. The four possible values for mode are bold, underline, reverse, or none. The sequences that de- termine these values are taken from the terminfo database. The bold sequence is taken from "md" and "me", reverse is taken from "mr" and "me", and underline is taken from "us" and "ue". Sets the character attribute used to mark a Henkan region that is the result of the Kana-Kanji conversion. The four possible values for mode are bold, underline, reverse, or none. The sequences that determine these values are taken from the terminfo data- base. The old sequence is taken from "md" and "me", reverse is taken from "mr" and "me", and underline is taken from "us" and "ue". Sets the Kana-Kanji conversion key map file for the ter- minal. Displays the current Kana-Kanji conversion key map, a traversal tree with a maximum sequence length of 15 characters. Uses one (uses two) backspaces to erase one Kanji character on the terminal. Uses (does not use) a single 2-byte zenkaku space (two ASCII spaces) to blank out one Kanji character on the ter- minal. If terminal code is either jis7 or jis8, changes (does not change) the terminal state to shift out whenever a newline code is output. Enables (disables) the extended Kana-Kanji con- version mode. The char value sets or resets the character that toggles in and out of extended Kana-Kanji conversion mode. Modes for Software On-Demand Loading (I18N) Enables (disables) the Software On-Demand Loading (SoftODL) service. Sets the maximum size, in characters, of the ODL buffer. This size should be the same as the terminal's font cache size. The default size is 256. Sets the type of the ODL buffer replacement strategy. The type arguments can be either fifo (First-In-First-Out) or lru (Least- Recently-Used). Sets the path to the ODL database files. If this path is not specified, the default path is the one for the user's private database (if private databases are allowed on the system) or to the systemwide ODL database. Resets the ODL service and clears the inter- nal ODL buffers. Displays the current ODL service attributes. Modes for the Software Phrase Input Method (I18N) Enables (disables) the Software Phrase Input Method (SIM) service. Specifies the key that toggles in and out of phrase input mode. Sets the current class name for locating the appropriate phrase in the phrase database. Sets the path of the phrase database. Sets the dis- play mode of the SIM service. The two supported mode values are offspot (default) and onspot. In offspot mode, the input phrase name is displayed at the 26th line of your terminal, if supported. In onspot mode, the phrase name is displayed at the current cursor posi- tion. With DECterm, xterm, or other terminal emulators that do not support the 26th display line, specify the onspot mode value. Displays the current SIM service attributes. Miscellaneous Asian Terminal Modes (I18N) Enables (disables) the history mechanism. The key value sets or resets the key used to toggle in and out of history mode. Note that command lines that are fewer than three characters long are not recorded in the history list. Thai Terminal Modes (I18N) Sets the current line discipline to Thai. Sets the WTT Input Sequence Check (ISC) mode. Valid mode values are 0, 1, or 2, which stand for pass-through, basic check, or strict mode, respectively. Enables or disables input reordering. Enables (disables) the history mechanism. The key value sets or resets the key used to toggle in and out of his- tory mode. Note that command lines that are fewer than three characters long are not recorded in the history list. Compatibility Modes Resets Erase and Kill characters back to the system defaults. Same as echok. Same as ixon (-ixon). Same as ixoff (-ixoff). Same as ixany (-ixany). Sets all modes suitable for terminals supplied by Digital Equipment Corporation. (The control-character Erase is set to ^?). (I18N) For the Asian (atty) and Thai (ttty) terminal interfaces, dec also switches the line discipline back to the default TTY- DISC line discipline. Same as echoe (-echoe). Same as echoctl (-echoctl). Sets (clears) echoe, echoke, and echoctl. Sends output characters with no (with) output processing. Expands (does not expand) tabs to spaces. Same as ofill (-ofill). Same as -a. Does not (does) send HANGUP signal if carrier drops. Does character fill and uses Null character. Does character fill and uses Delete character. Sets modes suitable for the Teletype Corporation Model 33 terminal. Sets modes suitable for the Teletype Corporation Model 37 terminal. Sets modes suitable for the Digital Equipment Corporation Mode VT05 terminal. Sets modes suitable for the General Electric TermiNet 300. Sets modes suitable for the Texas Instruments 700 series. Sets modes suitable for the Tektronix 4014 terminal. Prints only the line speed and a trailing semicolon (;). Prints only the terminal size. If no options are specified, an unspecified subset of the information displayed for the -a option is displayed. If the terminal input speed and output speed are the same, the speed information is displayed as follows: speed speed baud Otherwise, speeds are displayed as follows: ispeed ispeed baud; os- peed ospeed baud; Control-characters are displayed as follows: control-character = value In this display, value is either the character, some visual representa- tion of the character if it is nonprinting, or the string undef if the character is disabled. EXIT STATUS The stty utility exits with one of the following values: The terminal options were read or set successfully. An error occurred. ENVIRONMENT VARIABLES The following environment variables affect the execution of stty: Pro- vides a default value for the internationalization variables that are unset or null. If LANG is unset or null, the corresponding value from the default locale is used. If any of the internationalization vari- ables contain an invalid setting, the utility behaves as if none of the variables had been defined. If set to a non-empty string value, over- rides the values of all the other internationalization variables. De- termines 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). Determines the locale for the format and contents of diagnostic messages written to standard error. Deter- mines the location of message catalogues for the processing of LC_MES- SAGES. SEE ALSO Commands: tty(1) Functions: ioctl(2) Routines: curses(3), tcgetattr(3), tcsetattr(3), ttyname(3) Files: termios(4), atty(7), tty(7), ttty(7) Standards: standards(5) Others: Chinese(5), i18n_intro(5), iconv_intro(5), Japanese(5), Ko- rean(5), Thai(5) stty(1)