The following operands shall be supported to set the terminal
characteristics.
Control Modes
parenb (-parenb)
Enable (disable) parity generation and detection.
This shall have the effect of setting (not setting)
PARENB in the termios c_cflag field, as defined in
the Base Definitions volume of POSIX.1‐2017, Chapter
11, General Terminal Interface.
parodd (-parodd)
Select odd (even) parity. This shall have the effect
of setting (not setting) PARODD in the termios
c_cflag field, as defined in the Base Definitions
volume of POSIX.1‐2017, Chapter 11, General Terminal
Interface.
cs5 cs6 cs7 cs8
Select character size, if possible. This shall have
the effect of setting CS5, CS6, CS7, and CS8,
respectively, in the termios c_cflag field, as
defined in the Base Definitions volume of
POSIX.1‐2017, Chapter 11, General Terminal Interface.
number Set terminal baud rate to the number given, if
possible. If the baud rate is set to zero, the modem
control lines shall no longer be asserted. This shall
have the effect of setting the input and output
termios baud rate values as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
ispeed number
Set terminal input baud rate to the number given, if
possible. If the input baud rate is set to zero, the
input baud rate shall be specified by the value of
the output baud rate. This shall have the effect of
setting the input termios baud rate values as defined
in the Base Definitions volume of POSIX.1‐2017,
Chapter 11, General Terminal Interface.
ospeed number
Set terminal output baud rate to the number given, if
possible. If the output baud rate is set to zero, the
modem control lines shall no longer be asserted. This
shall have the effect of setting the output termios
baud rate values as defined in the Base Definitions
volume of POSIX.1‐2017, Chapter 11, General Terminal
Interface.
hupcl (-hupcl)
Stop asserting modem control lines (do not stop
asserting modem control lines) on last close. This
shall have the effect of setting (not setting) HUPCL
in the termios c_cflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
hup (-hup) Equivalent to hupcl(-hupcl).
cstopb (-cstopb)
Use two (one) stop bits per character. This shall
have the effect of setting (not setting) CSTOPB in
the termios c_cflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
cread (-cread)
Enable (disable) the receiver. This shall have the
effect of setting (not setting) CREAD in the termios
c_cflag field, as defined in the Base Definitions
volume of POSIX.1‐2017, Chapter 11, General Terminal
Interface.
clocal (-clocal)
Assume a line without (with) modem control. This
shall have the effect of setting (not setting) CLOCAL
in the termios c_cflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
It is unspecified whether stty shall report an error if an
attempt to set a Control Mode fails.
Input Modes
ignbrk (-ignbrk)
Ignore (do not ignore) break on input. This shall
have the effect of setting (not setting) IGNBRK in
the termios c_iflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
brkint (-brkint)
Signal (do not signal) INTR on break. This shall have
the effect of setting (not setting) BRKINT in the
termios c_iflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
ignpar (-ignpar)
Ignore (do not ignore) bytes with parity errors. This
shall have the effect of setting (not setting) IGNPAR
in the termios c_iflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
parmrk (-parmrk)
Mark (do not mark) parity errors. This shall have the
effect of setting (not setting) PARMRK in the termios
c_iflag field, as defined in the Base Definitions
volume of POSIX.1‐2017, Chapter 11, General Terminal
Interface.
inpck (-inpck)
Enable (disable) input parity checking. This shall
have the effect of setting (not setting) INPCK in the
termios c_iflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
istrip (-istrip)
Strip (do not strip) input characters to seven bits.
This shall have the effect of setting (not setting)
ISTRIP in the termios c_iflag field, as defined in
the Base Definitions volume of POSIX.1‐2017, Chapter
11, General Terminal Interface.
inlcr (-inlcr)
Map (do not map) NL to CR on input. This shall have
the effect of setting (not setting) INLCR in the
termios c_iflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
igncr (-igncr)
Ignore (do not ignore) CR on input. This shall have
the effect of setting (not setting) IGNCR in the
termios c_iflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
icrnl (-icrnl)
Map (do not map) CR to NL on input. This shall have
the effect of setting (not setting) ICRNL in the
termios c_iflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
ixon (-ixon)
Enable (disable) START/STOP output control. Output
from the system is stopped when the system receives
STOP and started when the system receives START. This
shall have the effect of setting (not setting) IXON
in the termios c_iflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
ixany (-ixany)
Allow any character to restart output. This shall
have the effect of setting (not setting) IXANY in the
termios c_iflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
ixoff (-ixoff)
Request that the system send (not send) STOP
characters when the input queue is nearly full and
START characters to resume data transmission. This
shall have the effect of setting (not setting) IXOFF
in the termios c_iflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
Output Modes
opost (-opost)
Post-process output (do not post-process output;
ignore all other output modes). This shall have the
effect of setting (not setting) OPOST in the termios
c_oflag field, as defined in the Base Definitions
volume of POSIX.1‐2017, Chapter 11, General Terminal
Interface.
onlcr (-onlcr)
Map (do not map) NL to CR-NL on output. This shall
have the effect of setting (not setting) ONLCR in the
termios c_oflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
ocrnl (-ocrnl)
Map (do not map) CR to NL on output. This shall have
the effect of setting (not setting) OCRNL in the
termios c_oflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
onocr (-onocr)
Do not (do) output CR at column zero. This shall have
the effect of setting (not setting) ONOCR in the
termios c_oflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
onlret (-onlret)
The terminal newline key performs (does not perform)
the CR function. This shall have the effect of
setting (not setting) ONLRET in the termios c_oflag
field, as defined in the Base Definitions volume of
POSIX.1‐2017, Chapter 11, General Terminal Interface.
ofill (-ofill)
Use fill characters (use timing) for delays. This
shall have the effect of setting (not setting) OFILL
in the termios c_oflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
ofdel (-ofdel)
Fill characters are DELs (NULs). This shall have the
effect of setting (not setting) OFDEL in the termios
c_oflag field, as defined in the Base Definitions
volume of POSIX.1‐2017, Chapter 11, General Terminal
Interface.
cr0 cr1 cr2 cr3
Select the style of delay for CRs. This shall have
the effect of setting CRDLY to CR0, CR1, CR2, or CR3,
respectively, in the termios c_oflag field, as
defined in the Base Definitions volume of
POSIX.1‐2017, Chapter 11, General Terminal Interface.
nl0 nl1 Select the style of delay for NL. This shall have the
effect of setting NLDLY to NL0 or NL1, respectively,
in the termios c_oflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
tab0 tab1 tab2 tab3
Select the style of delay for horizontal tabs. This
shall have the effect of setting TABDLY to TAB0,
TAB1, TAB2, or TAB3, respectively, in the termios
c_oflag field, as defined in the Base Definitions
volume of POSIX.1‐2017, Chapter 11, General Terminal
Interface. Note that TAB3 has the effect of
expanding <tab> characters to <space> characters.
tabs (-tabs)
Synonym for tab0 (tab3).
bs0 bs1 Select the style of delay for <backspace> characters.
This shall have the effect of setting BSDLY to BS0 or
BS1, respectively, in the termios c_oflag field, as
defined in the Base Definitions volume of
POSIX.1‐2017, Chapter 11, General Terminal Interface.
ff0 ff1 Select the style of delay for <form-feed> characters.
This shall have the effect of setting FFDLY to FF0 or
FF1, respectively, in the termios c_oflag field, as
defined in the Base Definitions volume of
POSIX.1‐2017, Chapter 11, General Terminal Interface.
vt0 vt1 Select the style of delay for <vertical-tab>
characters. This shall have the effect of setting
VTDLY to VT0 or VT1, respectively, in the termios
c_oflag field, as defined in the Base Definitions
volume of POSIX.1‐2017, Chapter 11, General Terminal
Interface.
Local Modes
isig (-isig)
Enable (disable) the checking of characters against
the special control characters INTR, QUIT, and SUSP.
This shall have the effect of setting (not setting)
ISIG in the termios c_lflag field, as defined in the
Base Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
icanon (-icanon)
Enable (disable) canonical input (ERASE and KILL
processing). This shall have the effect of setting
(not setting) ICANON in the termios c_lflag field, as
defined in the Base Definitions volume of
POSIX.1‐2017, Chapter 11, General Terminal Interface.
iexten (-iexten)
Enable (disable) any implementation-defined special
control characters not currently controlled by
icanon, isig, ixon, or ixoff. This shall have the
effect of setting (not setting) IEXTEN in the termios
c_lflag field, as defined in the Base Definitions
volume of POSIX.1‐2017, Chapter 11, General Terminal
Interface.
echo (-echo)
Echo back (do not echo back) every character typed.
This shall have the effect of setting (not setting)
ECHO in the termios c_lflag field, as defined in the
Base Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
echoe (-echoe)
The ERASE character visually erases (does not erase)
the last character in the current line from the
display, if possible. This shall have the effect of
setting (not setting) ECHOE in the termios c_lflag
field, as defined in the Base Definitions volume of
POSIX.1‐2017, Chapter 11, General Terminal Interface.
echok (-echok)
Echo (do not echo) NL after KILL character. This
shall have the effect of setting (not setting) ECHOK
in the termios c_lflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
echonl (-echonl)
Echo (do not echo) NL, even if echo is disabled. This
shall have the effect of setting (not setting) ECHONL
in the termios c_lflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
noflsh (-noflsh)
Disable (enable) flush after INTR, QUIT, SUSP. This
shall have the effect of setting (not setting) NOFLSH
in the termios c_lflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
tostop (-tostop)
Send SIGTTOU for background output. This shall have
the effect of setting (not setting) TOSTOP in the
termios c_lflag field, as defined in the Base
Definitions volume of POSIX.1‐2017, Chapter 11,
General Terminal Interface.
Special Control Character Assignments
<control>‐character string
Set <control>‐character to string. If <control>‐character
is one of the character sequences in the first column of
the following table, the corresponding the Base Definitions
volume of POSIX.1‐2017, Chapter 11, General Terminal
Interface control character from the second column shall be
recognized. This has the effect of setting the
corresponding element of the termios c_cc array (see the
Base Definitions volume of POSIX.1‐2017, Chapter 13,
Headers, <termios.h>).
Table: Control Character Names in stty
┌──────────────────┬────────────────┬─────────────────┐
│Control Character │ c_cc Subscript │ Description │
├──────────────────┼────────────────┼─────────────────┤
│eof │ VEOF │ EOF character │
│eol │ VEOL │ EOL character │
│erase │ VERASE │ ERASE character │
│intr │ VINTR │ INTR character │
│kill │ VKILL │ KILL character │
│quit │ VQUIT │ QUIT character │
│susp │ VSUSP │ SUSP character │
│start │ VSTART │ START character │
│stop │ VSTOP │ STOP character │
└──────────────────┴────────────────┴─────────────────┘
If string is a single character, the control character
shall be set to that character. If string is the two-
character sequence "^-" or the string undef, the control
character shall be set to _POSIX_VDISABLE , if it is in
effect for the device; if _POSIX_VDISABLE is not in effect
for the device, it shall be treated as an error. In the
POSIX locale, if string is a two-character sequence
beginning with <circumflex> ('^'), and the second character
is one of those listed in the "^c" column of the following
table, the control character shall be set to the
corresponding character value in the Value column of the
table.
Table: Circumflex Control Characters in stty
┌──────────────┬────────────────┬──────────────┐
│ ^c Value │ ^c Value │ ^c Value │
├──────────────┼────────────────┼──────────────┤
│a, A <SOH> │ l, L <FF> │ w, W <ETB> │
│b, B <STX> │ m, M <CR> │ x, X <CAN> │
│c, C <ETX> │ n, N <SO> │ y, Y <EM> │
│d, D <EOT> │ o, O <SI> │ z, Z <SUB> │
│e, E <ENQ> │ p, P <DLE> │ [ <ESC> │
│f, F <ACK> │ q, Q <DC1> │ \ <FS> │
│g, G <BEL> │ r, R <DC2> │ ] <GS> │
│h, H <BS> │ s, S <DC3> │ ^ <RS> │
│i, I <HT> │ t, T <DC4> │ _ <US> │
│j, J <LF> │ u, U <NAK> │ ? <DEL> │
│k, K <VT> │ v, V <SYN> │ │
└──────────────┴────────────────┴──────────────┘
min number
Set the value of MIN to number. MIN is used in non-
canonical mode input processing (icanon).
time number
Set the value of TIME to number. TIME is used in non-
canonical mode input processing (icanon).
Combination Modes
saved settings
Set the current terminal characteristics to the saved
settings produced by the -g option.
evenp or parity
Enable parenb and cs7; disable parodd.
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. Raw mode shall be
equivalent to setting:
stty cs8 erase ^- kill ^- intr ^- \
quit ^- eof ^- eol ^- -post -inpck
nl (-nl)
Disable (enable) icrnl. In addition, -nl unsets inlcr and
igncr.
ek Reset ERASE and KILL characters back to system defaults.
sane
Reset all modes to some reasonable, unspecified, values.
