BSD solaris linux


set the options for a terminal device interface

stty [-a | -e | -g] [-f file] [operands ]

Sets or displays on terminal characteristics for the device that is its standard input.

Editor note: Many of these apply to terminals remotely connected serial communication lines and are not applicatable to console.
Most interesting operatnds which do apply to CONSOLE are:

isig, noflsh, size, rows, cols
Enable (disable)generating signals if input contains special control characters
usual keystrokes: INTR (^?), QUIT (^U), STATUS (^T) and SUSP (^C).
Disable (enable) flush of pending output after INTR, QUIT, or SUSP.
do not send SIGTTOU for background output, causes background jobs to stop if they attempt terminal output.
do not expand) tabs to spaces on output.

If no options or operands reports the settings of a subset of characteristics as well as additional ones if they differ from their default values.

speed 9600 baud;
lflags: echoe echoke echoctl pendin
oflags: -oxtabs
cflags: cs8 -parenb
-a Display all the current settings for the terminal to standard output as per IEEE Std 1003.2 POSIX.2) stty all|everything Reports all the terminal modes as with stty -a, except that the control characters are printed in a columnar format.
 speed 9600 baud; 30 rows; 110 columns;
lflags: icanon isig iexten echo echoe -echok echoke -echonl echoctl
        -echoprt -altwerase -noflsh -tostop -flusho pendin -nokerninfo -extproc
iflags: -istrip icrnl -inlcr -igncr ixon -ixoff ixany imaxbel -iutf8
        -ignbrk brkint -inpck -ignpar -parmrk
oflags: opost onlcr -oxtabs -onocr -onlret
cflags: cread cs8 -parenb -parodd hupcl -clocal -cstopb -crtscts -dsrflow -dtrflow -mdmbuf
cchars: eof = ^D; 
        intr = ^C; kill= ^U; quit = ^\; 
        min = 1; reprint = ^R; status = ^T;
        stop = ^S; start = ^Q; discard = ^O; susp = ^Z; dsusp = ^Y;
         time = 0; 
        lnext = ^V; erase = ^?; werase = ^W; eol = ; eol2 = ; 
-e Display all the current settings for the terminal to standard output in traditional BSD all format.
speed 9600 baud; 30 rows; 110 columns;
lflags: icanon isig iexten echo echoe -echok echoke -echonl echoctl
        -echoprt -altwerase -noflsh -tostop -flusho pendin -nokerninfo -extproc
iflags: -istrip icrnl -inlcr -igncr ixon -ixoff ixany imaxbel -iutf8
        -ignbrk brkint -inpck -ignpar -parmrk
oflags: opost onlcr -oxtabs -onocr -onlret
cflags: cread cs8 -parenb -parodd hupcl -clocal -cstopb -crtscts -dsrflow -dtrflow -mdmbuf
discard dsusp   eof     eol     eol2    erase   intr    kill    lnext   
^O      ^Y      ^D      <undef> <undef> ^?      ^C      ^U      ^V      
min     quit    reprint start   status  stop    susp    time    werase  
1       ^\      ^R      ^Q      ^T      ^S      ^Z      0       ^W     
-f Open and use the terminal named by file rather than using standard input. The file is opened using the O_NONBLOCK flag of open, making it possible to set or display settings on a terminal that might otherwise block on the open.

-g Display all the current settings for the terminal to standard output in a form that may be used as an argument to a subsequent invocation of stty to restore the current terminal state as per IEEE Std 1003.2 POSIX.2

Control Modes:
affect hardware characteristics associated with the terminal, corresponds to the c_cflag in the termios structure.
nnnn Set terminal baud rate to nnnn. If zero, modem control is no longer asserted.
a communications line without with modem control.
Enable (disable) the receiver.
Enable (disable) RTS/CTS flow control. (CRTs are fast enough to not need flow control).
cs5 cs6 cs7 cs8 Select character size in bits (cs7 most common).
Use two (one) stop bits per character.
Stop asserting modem control (do not stop) asserting modem control on last close.
speed nnnn sets both ispeed and ospeed to nnnn.examples 1200, 2400,4800 and 9600
ispeed nnnn Set terminal input baud rate . If zero, the input baud rate is set to the value of the output baud rate.
ospeed nnnn Set terminal output baud rate. If zero, modem control is no longer asserted.
Enable (disable) parity generation and detection.
Select odd (even) parity.
-evenp -oddp and -parity.
evenp Enable parenb and cs7; disable parodd.
-oddp Same as -evenp and -parity.
oddp Enable parenb, cs7, and parodd.
-parity Disable parenb; set cs8.
parity Same as evenp.
pass8 The converse of parity.
Input Modes: This corresponds to the c_iflag in the termios structure.
Enable (disable) input parity checking.
Mark (do not mark) characters with parity errors.
Ignore (do not ignore) characters with parity errors.
Ignore (do not ignore) break on input.
Signal (do not signal) INTR when system receives a break signal.
Map (do not map) CR to NL on input.
Enable (disable) icrnl. , -nl unsets inlcr and igncr.
Map (do not map) NL to CR on input.
Ignore (do not ignore) CR on input.
If imaxbel is set and the input queue limit has been reached, subsequent input causes the system to send an ASCII BEL character to the output queue (the terminal beeps )
If imaxbel is unset and the input queue is full, the next input character causes the entire input and output queues to be discarded!
Strip (do not strip) input characters to seven bits.
input characters are UTF-8 encoded.
system sends (not send) START/STOP characters (ASCII X-on/X-off) when the input queue is nearly empty/full.
Output from the system is stopped when the system receives STOP and started when the system receives START( -ixon disables this)
Allow any character to restart output.
Output Modes:
corresponds to c_oflag of the termios structure.
( some mechanical terminals, without buffering cannot perform so movements fast enough)
bs0 bs1 style of delay for backspaces (e.g., set BSDLY to BS0)
cr0 cr1 cr2 cr3 style of delay for carriage returns (e.g., set CRDLY to CR0)
ff0 ff1 style of delay for form feeds (e.g., set FFDLY to FF0)
nl0 nl1 style of delay for newlines (e.g., set NLDLY to NL0)
tab0 tab1 tab2 tab3 style of delay for horizontal tabs (e.g., set TABDLY to TAB0)
Same as tab0 (tab3)
vt0 vt1 style of delay for vertical tabs (e.g., set VTDLY to VT0)
Use fill (x'00') characters (use timing) for delays.
Use DELs (NULs) as fill characters.
Map (do not map) CR to nl on output.
Map (do not map) NL to CR-NL output.
On the terminal, NL performs (does not perform) the CR function.
Do not (do) output CRs at column zero.
Post-process output (do not post-process output; ignore all other output modes)
Expand (do not expand) tabs to spaces on output. Local Modes: Local mode flags (lflags) affect various characteristics of terminal processing. interpretation of the 'l' in lflag is ``line discipline flag'', which corresponds to the c_lflag of the termios structure.
do not echo back (do echo) every character typed. Terminals in local mode have displayed the characters themselves..
Echo (do not echo) NL after KILL character.
Echo (do not echo) NL, even if echo is disabled. Some terminals position the "carriage" at position zero after a RETURN, but do not advance to the next line.
If set, echo control characters as ^X. Otherwise, control characters echo as themselves.
Same as echoctl.
The ERASE character shall (shall not) visually erase the last character
Same as echoe.
Same as echoe.
The KILL character shall (shall not) visually erase the current line
Same as echoke.
For printing terminals. echo erased characters backwards within ``\'' and ``/''. Otherwise, disable this feature.
Indicates output is (is not) being discarded.
Enable (disable) canonical input (ERASE and KILL processing)
Enable (disable) any implementation-defined special control characters that are not currently controlled by icanon, isig, ixoff, or ixon.
Enable (disable) the checking of input for the special control characters INTR, QUIT, and SUSP.
Disable (enable) flush after INTR, QUIT, or SUSP.
Send (do not send) SIGTTOU for background output. This causes background jobs to stop if they attempt terminal output.
Use (do not use) an alternate word erase algorithm when processing WERASE characters. which considers sequences of alphanumeric/underscores as words. It also skips the first preceding character in its classification (as a convenience, since the one preceding character could have been erased with simply an ERASE character.)
If set, flow control output based on condition of Carrier Detect. Otherwise, writes return an error if Carrier Detect is low (and Carrier is not being ignored with the CLOCAL flag.)
Indicates input is (is not) pending after a switch from non-canonical to canonical mode and will be re-input when a read becomes pending or more input arrives.
Control Characters:
control-character string Set control-character to string. If string is a single character, the control character is set to that character. If string is the two character sequence "^-" or the string "undef" the control character is disabled (i.e. set to {_POSIX_VDISABLE}.
control-                                     control-
character    Subscript    Description        character    Subscript    Description
_________    _________    _______________     _________    _________    _______________
eof          VEOF         EndOfFile 
eol          VEOL         EndOfLine          eol2         VEOL2        EOL2 
erase        VERASE       ERASE              erase2       VERASE2      ERASE2 
werase       VWERASE      WERASE 
intr         VINTR        INTRupt 
kill         VKILL        KILL 
quit         VQUIT        QUIT 
susp         VSUSP        SUSPend 
start        VSTART       START               stop         VSTOP        STOP 
dsusp        VDSUSP       DSUSP 
lnext        VLNEXT       LNEXT 
reprint      VREPRINT     REPRINT 
status       VSTATUS      STATUS 
min number
time number Set the value of min or time to number. MIN and TIME are used in Non-Canonical mode input processing
Combination Modes: saved settings Set the current terminal characteristics to the saved settings produced by -g .
cols number Same as columns.
columns number The terminal size is recorded as having number columns.
Set (disable) all modes suitable for a CRT display device.
Same as crt.
dec Set modes suitable for users of Digital Equipment Corporation systems (ERASE, KILL, and INTR are set to ^?, ^U, and ^C; ixany is disabled, and crt is enabled.)
ek Reset ERASE, ERASE2, and KILL back to system defaults.
terminal processing is being performed by either the terminal hardware or by the remote side connected to a pty.
Enable (disable) the system generated status line associated with processing a STATUS character (usually set to ^T) The status line consists of the system load average, the current command name, its process ID, the event the process is waiting on (or the status of the process) the user and system times, percent cpu, and current memory usage.
load: 3.64 cmd: bash 12892 waiting 0.00u 0.01s
waiting or running or uninterruptible
no input or output processing is performed. If unset, change the modes of the terminal to some reasonable state that performs input and output processing. unsetting raw may not put back all the setting that were previously in effect. To set the terminal into a raw state and then restore it
                 save_state=$(stty -g)
                 stty raw
                 stty "$save_state"

rows number The terminal size is recorded as having number rows.
sane sets all modes to reasonable values
cooked Same as sane.
size window size is displayed rows columns.
tty Set the line discipline to the standard terminal line discipline TTYDISC.
new Same as tty.
old Same as tty.
brk value Same as the control character eol.
cbreak If set, enables brkint, ixon, imaxbel, opost, isig, iexten, and -icanon. If unset, same as sane.
The converse of ixany.
flush value Same as the control character discard.
The converse of opost.
Same as echoprt.
rprnt value Same as the control character reprint.
The converse of oxtabs.
Same as ixoff.
DIAGNOSTICS exits 0 on success, and >0 if an error occurs. LEGACY DESCRIPTION In legacy operation, the bs[01], cr[0-3], ff[01], nl[01], tab[0-3], and vt[01] control modes are not accepted, nor are ocrnl
-ocrnl, ofdel (-ofdel) ofill (-ofill) onlret (-onlret) and onocr
-onocr. SEE ALSO termios(4) compat(5)