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stty - change and print terminal line settings


stty [-F DEVICE] [--file=DEVICE] [SETTING]... stty [-F DEVICE] [--file=DEVICE] [-a|--all] stty [-F DEVICE] [--file=DEVICE] [-g|--save]


Print or change terminal characteristics.

-a, --all
print all current settings in human-readable form

-g, --save
print all current settings in a stty-readable form

-F, --file=DEVICE
open and use the specified DEVICE instead of stdin

--help display this help and exit

output version information and exit

Optional - before SETTING indicates negation. An * marks non-POSIX settings. The underlying system defines which settings are available.

Special characters:
* dsusp CHAR
CHAR will send a terminal stop signal once input flushed

eof CHAR
CHAR will send an end of file (terminate the input)

eol CHAR
CHAR will end the line

* eol2 CHAR
alternate CHAR for ending the line

erase CHAR
CHAR will erase the last character typed

intr CHAR
CHAR will send an interrupt signal

kill CHAR
CHAR will erase the current line

* lnext CHAR
CHAR will enter the next character quoted

quit CHAR
CHAR will send a quit signal

* rprnt CHAR
CHAR will redraw the current line

start CHAR
CHAR will restart the output after stopping it

stop CHAR
CHAR will stop the output

susp CHAR
CHAR will send a terminal stop signal

* swtch CHAR
CHAR will switch to a different shell layer

* werase CHAR
CHAR will erase the last word typed

Special settings:

set the input and output speeds to N bauds

* cols N
tell the kernel that the terminal has N columns

* columns N
same as cols N

ispeed N
set the input speed to N

* line N
use line discipline N

min N with -icanon, set N characters minimum for a completed read

ospeed N
set the output speed to N

* rows N
tell the kernel that the terminal has N rows

* size print the number of rows and columns according to the kernel

speed print the terminal speed

time N with -icanon, set read timeout of N tenths of a second

Control settings:
disable modem control signals

allow input to be received

* [-]crtscts
enable RTS/CTS handshaking

set character size to N bits, N in [5..8]

use two stop bits per character (one with ‘-’)

[-]hup send a hangup signal when the last process closes the tty

same as [-]hup

generate parity bit in output and expect parity bit in input

set odd parity (even with ‘-’)

Input settings:
breaks cause an interrupt signal

translate carriage return to newline

ignore break characters

ignore carriage return

ignore characters with parity errors

* [-]imaxbel
beep and do not flush a full input buffer on a character

translate newline to carriage return

enable input parity checking

clear high (8th) bit of input characters

* [-]iutf8
assume input characters are UTF-8 encoded

* [-]iuclc
translate uppercase characters to lowercase

* [-]ixany
let any character restart output, not only start character

enable sending of start/stop characters

enable XON/XOFF flow control

mark parity errors (with a 255-0-character sequence)

same as [-]ixoff

Output settings:
* bsN backspace delay style, N in [0..1]

* crN carriage return delay style, N in [0..3]

* ffN form feed delay style, N in [0..1]

* nlN newline delay style, N in [0..1]

* [-]ocrnl
translate carriage return to newline

* [-]ofdel
use delete characters for fill instead of null characters

* [-]ofill
use fill (padding) characters instead of timing for delays

* [-]olcuc
translate lowercase characters to uppercase

* [-]onlcr
translate newline to carriage return-newline

* [-]onlret
newline performs a carriage return

* [-]onocr
do not print carriage returns in the first column

postprocess output

* tabN horizontal tab delay style, N in [0..3]

* tabs same as tab0

* -tabs
same as tab3

* vtN vertical tab delay style, N in [0..1]

Local settings:
echo erase characters as backspace-space-backspace

* crtkill
kill all line by obeying the echoprt and echoe settings

* -crtkill
kill all line by obeying the echoctl and echok settings

* [-]ctlecho
echo control characters in hat notation (’^c’)

echo input characters

* [-]echoctl
same as [-]ctlecho

same as [-]crterase

echo a newline after a kill character

* [-]echoke
same as [-]crtkill

echo newline even if not echoing other characters

* [-]echoprt
echo erased characters backward, between ‘\’ and ‘/’

enable erase, kill, werase, and rprnt special characters

enable non-POSIX special characters

enable interrupt, quit, and suspend special characters

disable flushing after interrupt and quit special characters

* [-]prterase
same as [-]echoprt

* [-]tostop
stop background jobs that try to write to the terminal

* [-]xcase
with icanon, escape with ‘\’ for uppercase characters

Combination settings:
* [-]LCASE
same as [-]lcase

cbreak same as -icanon

same as icanon

cooked same as brkint ignpar istrip icrnl ixon opost isig icanon, eof and eol characters to their default values

same as raw

same as echoe echoctl echoke

same as echoe echoctl echoke -ixany intr ^c erase 0177 kill ^u

* [-]decctlq
same as [-]ixany

erase and kill characters to their default values

evenp same as parenb -parodd cs7

-evenp same as -parenb cs8

* [-]lcase
same as xcase iuclc olcuc

litout same as -parenb -istrip -opost cs8

same as parenb istrip opost cs7

same as -icrnl -onlcr

same as icrnl -inlcr -igncr onlcr -ocrnl -onlret

same as parenb parodd cs7

same as -parenb cs8

same as [-]evenp

pass8 same as -parenb -istrip cs8

-pass8 same as parenb istrip cs7

same as -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr -icrnl -ixon -ixoff -iuclc -ixany -imaxbel -opost -isig -icanon -xcase min 1 time 0

same as cooked

sane same as cread -ignbrk brkint -inlcr -igncr icrnl -iutf8 -ixoff -iuclc -ixany imaxbel opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0 isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt echoctl echoke, all special characters to their default values.

Handle the tty line connected to standard input. Without arguments, prints baud rate, line discipline, and deviations from stty sane. In settings, CHAR is taken literally, or coded as in ^c, 0x37, 0177 or 127; special values ^- or undef used to disable special characters.


Written by David MacKenzie.

Reporting Bugs

Report bugs to <>.


Copyright (C) 2006 Free Software Foundation, Inc. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <>. There is NO WARRANTY, to the extent permitted by law.

See Also

The full documentation for stty is maintained as a Texinfo manual. If the info and stty programs are properly installed at your site, the command

info stty

should give you access to the complete manual.

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