Name

stty — change and print terminal line settings

Synopsis

stty [ −F DEVICE | −−file=DEVICE ] [SETTING...]

stty [ −F DEVICE | −−file=DEVICE ] [ −a | −−all ]

stty [ −F DEVICE | −−file=DEVICE ] [ −g | −−save ]

DESCRIPTION

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

−−help

display this help and exit

−−version

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:

N

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

speed

print the terminal speed

time N

with −icanon, set read timeout of N tenths of a second

Control settings:

[−]clocal

disable modem control signals

[−]cread

allow input to be received

[−]crtscts enable RTS/CTS handshaking

csN

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

[−]cstopb

use two stop bits per character (one with '−')

[−]hup

send a hangup signal when the last process closes the tty

[−]hupcl

same as [−]hup

[−]parenb

generate parity bit in output and expect parity bit in input

[−]parodd

set odd parity (or even parity with '−')

[−]cmspar use "stick" (mark/space) parity

Input settings:

[−]brkint

breaks cause an interrupt signal

[−]icrnl

translate carriage return to newline

[−]ignbrk

ignore break characters

[−]igncr

ignore carriage return

[−]ignpar

ignore characters with parity errors

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

[−]inlcr

translate newline to carriage return

[−]inpck

enable input parity checking

[−]istrip

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

[−]ixoff

enable sending of start/stop characters

[−]ixon

enable XON/XOFF flow control

[−]parmrk

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

[−]tandem

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

    [−]opost

    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:

[−]crterase

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

echo input characters

[−]echoctl same as [−]ctlecho

[−]echoe

same as [−]crterase

[−]echok

echo a newline after a kill character

[−]echoke same as [−]crtkill

[−]echonl

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

[−]icanon

enable special characters: erase, kill, werase, rprnt

[−]iexten

enable non−POSIX special characters

[−]isig

enable interrupt, quit, and suspend special characters

[−]noflsh

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

    −cbreak

    same as icanon

    cooked

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

    −cooked

    same as raw

    crt

    same as echoe echoctl echoke

    dec

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

    [−]decctlq same as [−]ixany

    ek

    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

    −litout

    same as parenb istrip opost cs7

    nl

    same as −icrnl −onlcr

    −nl

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

    oddp

    same as parenb parodd cs7

    −oddp

    same as −parenb cs8

    [−]parity

    same as [−]evenp

    pass8

    same as −parenb −istrip cs8

    −pass8

    same as parenb istrip cs7

    raw

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

    −raw

    same as cooked

    sane

    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.

AUTHOR

Written by David MacKenzie.

REPORTING BUGS

GNU coreutils online help: <https://www.gnu.org/software/coreutils/>

Report stty translation bugs to <https://translationproject.org/team/>

SEE ALSO

Full documentation at: <https://www.gnu.org/software/coreutils/stty>

or available locally via: info '(coreutils) stty invocation'

COPYRIGHT

Copyright © 2018 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.

This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.