NAME [Toc] [Back]
stty - set the options for a terminal port
SYNOPSIS [Toc] [Back]
stty [-a | -g | options]
DESCRIPTION [Toc] [Back]
stty sets or reports current settings of certain terminal I/O options
for the device that is the current standard input. The command takes
stty Report the settings of a system-defined set
stty -a Report all of current option settings;
stty -g Report current settings in a form that can be
used as an argument to another stty command.
stty options Set terminal I/O options as defined by
For detailed information about the modes listed below from Control
Modes through Local Modes as they relate to asynchronous lines, see
termio(7). For detailed information about the modes listed under
Hardware Flow Control Modes below, see termiox(7).
Options in the Combination Modes group are implemented using options
in the previous groups. Note that many combinations of options make
no sense, but no sanity checking is performed.
options are selected from the following:
Control Modes [Toc] [Back]
rows number Set the terminal window row size equal to
columns number Set the terminal window column size (width)
equal to number. cols can be used as an
abbreviation for columns.
parenb (-parenb) Enable (disable) parity generation and
parodd (-parodd) Select odd (even) parity.
cs5 cs6 cs7 cs8 Select character size (see termio(7)).
0 Hang up phone line immediately.
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50 75 110 134.5 150 200 300 600 900 1200 1800 2400
3600 4800 7200 9600 19200 38400 57600 115200 230400 exta extb
Set terminal baud rate to the number given,
if possible (some hardware interfaces do not
support all of the speeds listed here).
Speeds above 38400 are supported on Series
ispeed number Set terminal input baud rate to number. If
number is zero, the input baud rate is set to
the value of the output baud rate.
ospeed number Set terminal output baud rate to number. If
number is zero, the modem control lines are
released, which in turn disconnects the line.
hupcl (-hupcl) Hang up (do not hang up) modem connection on
hup (-hup) Same as hupcl (-hupcl).
cstopb (-cstopb) Use two (one) stop bits per character.
cread (-cread) Enable (disable) the receiver.
crts (-crts) Enable (disable) request-to-send.
clocal (-clocal) Assume a line without (with) modem control.
loblk (-loblk) Block (do not block) output from a noncurrent
+resetGSP Reset the Guardian Service Processor (GSP) of
the console. This mode can be used only by
the superuser. This is supported only on
Input Modes [Toc] [Back]
ignbrk (-ignbrk) Ignore (do not ignore) break on input.
ienqak (-ienqak) Enable (disable) ENQ-ACK Handshaking.
brkint (-brkint) Signal (do not signal) INTR on break.
ignpar (-ignpar) Ignore (do not ignore) parity errors.
parmrk (-parmrk) Mark (do not mark) parity errors (see
inpck (-inpck) Enable (disable) input parity checking.
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istrip (-istrip) Strip (do not strip) input characters to
inlcr (-inlcr) Map (do not map) newline character to
carriage return (CR) on input.
igncr (-igncr) Ignore (do not ignore) CR on input.
icrnl (-icrnl) Map (do not map) CR to a newline character on
iuclc (-iuclc) Map (do not map) uppercase alphabetic
characters to lowercase on input.
ixon (-ixon) Enable (disable) START/STOP output control.
Output is stopped by sending an ASCII DC3 and
started by sending an ASCII DC1.
ixany (-ixany) Allow any character (only DC1) to restart
ixoff (-ixoff) Request that the system send (not send)
START/STOP characters when the input queue is
imaxbel (-imaxbel) Echo (do not echo) BEL when the input line is
Output Modes [Toc] [Back]
opost (-opost) Post-process output (do not post-process
output; ignore all other output modes).
olcuc (-olcuc) Map (do not map) lowercase alphabetics to
uppercase on output.
onlcr (-onlcr) Map (do not map) newline character to a
carriage-return/newline character sequence on
ocrnl (-ocrnl) Map (do not map) CR to newline character on
onocr (-onocr) Do not (do) output CRs at column zero.
onlret (-onlret) On the terminal, a newline character performs
(does not perform) the CR function.
ofill (-ofill) Use fill characters (use timing) for delays.
ofdel (-ofdel) Fill characters are DELs ( NULs).
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cr0 cr1 cr2 cr3 Select style of delay for carriage returns
nl0 nl1 Select style of delay for newline characters
tab0 tab1 tab2 tab3 Select style of delay for horizontal tabs
bs0 bs1 Select style of delay for backspaces (see
ff0 ff1 Select style of delay for form-feeds (see
vt0 vt1 Select style of delay for vertical tabs (see
Local Modes [Toc] [Back]
isig (-isig) Enable (disable) the checking of characters
against the special control characters INTR
icanon (-icanon) Enable (disable) canonical input (ERASE and
iexten (-iexten) Enable (disable) any implementation-defined
special control characters not currently
controlled by icanon, isig, or ixon.
xcase (-xcase) Canonical (unprocessed) uppercase and
echo (-echo) Echo back (do not echo back) every character
echoe (-echoe) Echo (do not echo) ERASE character as a
backspace-space-backspace string. Note: this
mode erases the ERASEed character on many CRT
terminals. However, it does not keep track
of column position and, as a result, may not
correctly erase escaped characters, tabs, and
echok (-echok) Echo (do not echo) a newline character after
a KILL character.
lfkc (-lfkc) (obsolete) Same as echok (-echok).
echonl (-echonl) Echo (do not echo) newline character.
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noflsh (-noflsh) Disable (enable) flush after INTR or QUIT.
echoctl (-echoctl) Echo (do not echo) control characters as
^char, delete as ^?
echoprt (-echoprt) Echo (do not echo) erase character as
character is erased.
echoke (-echoke) BS-SP-BS erase (do not BS-SP-BS erase) entire
line on line kill.
flusho (-flusho) Output is (is not) being flushed.
pendin (-pendin) Retype (do not retype) pending output at next
read or input character.
tostop (-tostop) Enable (disable) generation of SIGTTOU
signals when background jobs attempt output.
Hardware Flow Control Modes [Toc] [Back]
The following options are reserved for use with those devices that
support hardware flow control through the termiox interface. If the
functionality is supported, this interface must be used.
rtsxoff (-rtsxoff) enable (disable) RTS hardware flow control on
input (see termiox(7))
ctsxon (-ctsxon) enable (disable) CTS hardware flow control on
output (see termiox(7))
Control Assignments [Toc] [Back]
control-character c Set control-character to c, where control-
character is erase, kill, intr, quit, eof,
eol, eol2, werase, lnext, min,or time (min
and time are used with -icanon; see
termio(7)). For systems that support job
control, susp and dsusp characters can also
be set. For systems that support shell
layers (see shl(1)) swtch can also be set.
If c is preceded by an (escaped from the
shell) circumflex (^), the value used is the
corresponding control character (for example,
^d represents Ctrl-d); ^? is interpreted as
DEL and ^- is interpreted as undefined.
line i Set line discipline to i where the value of i
ranges from zero through 127 decimal (See
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Combination Modes [Toc] [Back]
evenp or parity Enable parenb and cs7.
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 (no
ERASE, KILL, INTR, QUIT, EOT, or output post
processing). See WARNINGS.
nl (-nl) Unset (set) icrnl and onlcr . In addition -nl
unsets inlcr, igncr, ocrnl, and onlret.
lcase (-lcase) Set (unset) xcase, iuclc, and olcuc.
LCASE (-LCASE) Same as lcase (-lcase).
tabs (-tabs or tab3) Preserve (expand to spaces) tabs when
ek Reset ERASE and KILL characters back to
default # and @.
sane Reset all modes to some reasonable values.
term Set all modes suitable for the terminal type
term, where term is one of tty33, tty37,
vt05, tn300, ti700, hp, or tek.
Reporting Functions [Toc] [Back]
size Print terminal window size to standard output
in a rows-and-columns format.
+queryGSP Print the status of the Guardian Service
Processor (GSP) of the console. This function
can be used only by the superuser. This
feature is available only on specific
Control Character Default Assignments [Toc] [Back]
The control characters are assigned default values when the terminal
port is opened, see termio(7). The default values used are those
specified by the System V Interface Definition, Third Edition (SVID3),
except for the werase and lnext control characters, which are set to
_POSIX_VDISABLE to maintain binary compatibility with previous
releases of HP-UX.
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The default values for the control characters may be changed by a user
with root capability by using stty and redirecting stdin to the device
/dev/ttyconf. Any of the four command forms specified in the
Description section above may be used. However, only the control
character defaults will be reported or altered. It will have no
effect on the defaults for any of the other modes.
Note that these defaults will be used for all terminal ports in the
system, except the system console, and the changes will not become
effective for a particular port until it is (re)opened. The default
control character assignment will not work with the system console
because the system console is never closed while the system is
running, and therefore cannot be reopened.
Care should be exercised when re-assigning the control character
defaults. Control character values should be tested with applications
before assigning them as a default value.
EXTERNAL INFLUENCES [Toc] [Back]
LC_CTYPE determines the valid control characters for printing.
If LC_CTYPE is not specified in the environment or is set to the empty
string, the value of LANG is used as a default for each unspecified or
empty variable. If LANG is not specified or is set to the empty
string, a default of "C" (see lang(5)) is used instead of LANG. If
any internationalization variable contains an invalid setting, stty
behaves as if all internationalization variables are set to "C". See
International Code Set Support [Toc] [Back]
Single-byte character code sets are supported.
EXAMPLES [Toc] [Back]
stty kill '^X' intr '^C'
sets the delete-line character to ^X (Ctrl-X) and the interrupt
character to ^C. This command is usually found in the .login or
.profile file so that ^X and ^C need not be set by the user at each
stty kill '^X' intr '^C' werase '^W' </dev/ttyconf
sets the default values for the delete-line character to ^X (Ctrl-X),
the interrupt character to ^C, and the word erase character to ^W.
Any terminal port opened after this command is issued will see these
new default values for the kill, intr, and werase control characters.
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WARNINGS [Toc] [Back]
Use of raw mode produces certain side effects which have varied from
release to release in the past and may vary in the future. Relying on
these side effects in applications can lead to unreliable results in
the future and is therefore discouraged.
DEPENDENCIES [Toc] [Back]
Refer to the DEPENDENCIES section of termio(7) for a further
description of capabilities that are not supported.
SEE ALSO [Toc] [Back]
shl(1), tabs(1), ioctl(2), termio(7), termiox(7).
STANDARDS CONFORMANCE [Toc] [Back]
stty: SVID2, SVID3, XPG2, XPG3, XPG4, POSIX.2
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