STTY(1) STTY(1) NAME stty - set the options for a terminal SYNOPSIS stty [ -a ] [ -g ] [ options ] DESCRIPTION stty sets certain terminal I/O options for the device that is the current standard input; without arguments, it reports the settings of certain options. In this report, if a character is preceded by a caret (^), then the value of that option is the corresponding CTRL character (e.g., ``^H'' is CTRL-H ; in this case, recall that CTRL-H is the same as the ``backspace'' key.) The sequence ``^''' means that an option has a null value. For example, normally stty -a will report that the value of swtch is ``^'''; however, if csh(1) is used, swtch will have the value ``^Z''. -a reports all of the option settings; -g reports current settings in a form that can be used as an argument to another stty command; this does not include the rows and columns values. Options in the last group are implemented using options in the previous groups. Note that many combinations of options make no sense, but no sanity checking is performed. The options are selected from the following: Control Modes parenb (-parenb) enable (disable) parity generation and detection. parodd (-parodd) select odd (even) parity. cs5 cs6 cs7 cs8 select character size (see termio(7)). 0 hang up phone line immediately. 110 300 600 1200 1800 2400 4800 9600 19200 38400 57600 115200 etc. Set terminal input and output baud rate to the number given, if possible. (All speeds are not supported by all hardware interfaces.) ispeed ( <speed> ) where speed is a baud rate as defined above, set only the input baud rate to the given value, if possible (some hardware may require the input and output baud rate to be the same). If the speed specified is 0, set the input speed to match the output speed. ospeed ( <speed> ) where speed is a baud rate as defined above, set only the output baud rate to the given value, if possible (some hardware may require the input and output baud rate to be the same). If the speed specified is 0, a hangup is generated. hupcl (-hupcl) hang up (do not hang up) serial-line connections on last close. hup (-hup) same as hupcl (-hupcl). cstopb (-cstopb) use two (one) stop bits per character. cread (-cread) enable (disable) the receiver. clocal (-clocal) assume a line without (with) modem control. cnew_rtscts (-cnew_rtscts) enable (disable) RTS/CTS flow control. loblk (-loblk) block (do not block) output from a background job. tostop (-tostop) block (do not block) output from a background job (same as loblk). Input Modes ignbrk (-ignbrk) ignore (do not ignore) break on input. brkint (-brkint) signal (do not signal) INTR on break. ignpar (-ignpar) ignore (do not ignore) parity errors. parmrk (-parmrk) mark (do not mark) parity errors (see termio(7)). inpck (-inpck) enable (disable) input parity checking. istrip (-istrip) strip (do not strip) input characters to seven bits. inlcr (-inlcr) map (do not map) NL to CR on input. igncr (-igncr) ignore (do not ignore) CR on input. icrnl (-icrnl) map (do not map) CR to NL on input. iuclc (-iuclc) map (do not map) upper-case alphabetics to lower case on input. ixon (-ixon) enable (disable) START/STOP output control. Output is stopped by sending the stop character (default is CTRL-S) and started by sending the start character (default is CTRL-Q). ixany (-ixany) allow any character (only the start character like CTRL-Q) to restart output. decctlq (-decctlq) allow only the start character like CTRL-Q (allow any character) to restart output. An alias for -ixany. ixoff (-ixoff) request that the system send (not send) START/STOP characters when the input queue is nearly empty/full. imaxbel (-imaxbel) echo BEL if the input stream overflows. Output Modes opost (-opost) post-process output (do not post-process output; ignore all other output modes). olcuc (-olcuc) map (do not map) lower-case alphabetics to upper case on output. onlcr (-onlcr) map (do not map) NL to CR-NL on output. ocrnl (-ocrnl) map (do not map) CR to NL on output. onocr (-onocr) do not (do) output CRs at column zero. onlret (-onlret) on the terminal NL performs (does not perform) the CR function. ofill (-ofill) use fill characters (use timing) for delays. ofdel (-ofdel) fill characters are DELs (NULs). cr0 cr1 cr2 cr3 select style of delay for carriage returns (see termio(7)). nl0 nl1 select style of delay for line-feeds (see termio(7)). tab0 tab1 tab2 tab3 select style of delay for horizontal tabs (see termio(7)). bs0 bs1 select style of delay for backspaces (see termio(7)). ff0 ff1 select style of delay for form-feeds (see termio(7)). vt0 vt1 select style of delay for vertical tabs (see termio(7)). Local Modes isig (-isig) enable (disable) the checking of characters against the special control characters INTR, QUIT and SWTCH. icanon (-icanon) enable (disable) canonical input (ERASE and KILL processing). xcase (-xcase) canonical (unprocessed) upper/lower-case presentation. echo (-echo) echo back (do not echo back) every character typed. echoe (-echoe) echo (do not echo) ERASE character as a backspace-space- backspace string. Note: this mode will erase the ERASEed character on many CRT terminals; however, it does not keep track of column position and, as a result, may be confusing on escaped characters, tabs, and backspaces. echok (-echok) echo (do not echo) NL after KILL character. lfkc (-lfkc) the same as echok (-echok); obsolete. echoke (-echoke) echo (do not echo) the KILL character by erasing each character on the line from the screen (using the mechanism selected by echoe and echoprt). echoctl (-echoctl) Echo (do not echo) control characters as ^char, delete as ^?. echoprt (-echoprt) Echo (do not echo) erase character as character erased. echonl (-echonl) echo (do not echo) NL. noflsh (-noflsh) disable (enable) flush after INTR, QUIT or SWTCH. flusho (-flusho) If set, data written to the terminal is discarded. This bit is automatically set when the flush/discard control-character (see below) is typed. This bit is automatically cleared by subsequent input from the terminal. pendin (-pendin) Retype pending input at next read or input char then automatically clear pendin. Control Assignments line i set the line discipline to 0 (standard System V discipline) or 1 (4.3BSD csh(1) discipline). rows n set the number of rows for the terminal, used by some screen oriented programs. This is currently supported only on pty devices. cols n (or columns) set the number of columns for the terminal, used by some screen oriented programs. This is currently supported only on pty devices. control-character c set control-character to c, where control-character is intr, quit, erase, eof, eol, old-swtch, min, or time. (min and time are used with -icanon; see termio(7)). If line discipline is set to 1, the following control-characters can be set: lnext, werase, rprnt, flush (a.k.a. discard), stop, If c is preceded by an (escaped from the shell) caret (^), then the value used is the corresponding CTRL character (e.g., ``^D'' is a CTRL-D); ``^?'' is interpreted as DEL and ``^-'' or ``undef'' is interpreted as undefined. In the case of min and time , the numerical argument is interpreted as a literal value rather than as an ascii character. Combination Modes evenp or parity enable parenb and cs7. 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 (no ERASE, KILL, INTR, QUIT, SWTCH, EOT, or output post processing). iexten (-iexten) Enable (disable) any implementation-dependent special control characters not currently controlled by icanon, isig, ixon or ixoff. nl (-nl) set (unset) icrnl. In addition -nl unsets inlcr, igncr. lcase (-lcase) set (unset) xcase, iuclc, and olcuc. LCASE (-LCASE) same as lcase (-lcase). tabs (-tabs or tab3) preserve (expand to spaces) tabs when printing. ek reset ERASE and KILL characters back to normal ^H and ^U. sane resets all modes to some reasonable values. dec ERASE, KILL, and INTR characters set to ^?, ^U, and ^C; echoe and echok set; ixany unset. term set all modes suitable for the terminal type term, where term is one of tty33, tty37, vt05, tn300, ti700, or tek. SEE ALSO tabs(1), ioctl(2), termio(7) Page 5