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Section: User Commands (1)
Updated: September 2017
Index Return to Main Contents


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.

Mandatory arguments to long options are mandatory for short options too.

-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
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:

* discard CHAR
CHAR will toggle discarding of output
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
* [-]drain
wait for transmission before applying settings (on by default)
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
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 '-')
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 (or even parity with '-')
* [-]cmspar
use "stick" (mark/space) parity

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 NUL 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 '/'
* [-]extproc
enable "LINEMODE"; useful with high latency links
* [-]flusho
discard output
enable special characters: erase, kill, werase, rprnt
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
same as -icanon
same as icanon
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
same as parenb -parodd cs7
same as -parenb cs8
* [-]lcase
same as xcase iuclc olcuc
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
same as -parenb -istrip cs8
same as parenb istrip cs7
same as -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr -icrnl -ixon -ixoff -icanon -opost -isig -iuclc -ixany -imaxbel -xcase min 1 time 0
same as cooked
same as cread -ignbrk brkint -inlcr -igncr icrnl icanon iexten echo echoe echok -echonl -noflsh -ixoff -iutf8 -iuclc -ixany imaxbel -xcase -olcuc -ocrnl opost -ofill onlcr -onocr -onlret nl0 cr0 tab0 bs0 vt0 ff0 isig -tostop -ofdel -echoprt echoctl echoke -extproc -flusho, 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.  


GNU coreutils online help: <>
Report stty translation bugs to <>  


Copyright © 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.  


Full documentation at: <>
or available locally via: info aq(coreutils) stty invocationaq



Special characters:
Special settings:
Control settings:
Input settings:
Output settings:
Local settings:
Combination settings:

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