stty(1) manual page

Local mode flags (lflags) affect various and sundry characteristics of terminal processing. Historically the term "local" pertained to new job control features implemented by Jim Kulp on a Pdp 11/70 at IIASA. Later the driver ran on the first VAX at Evans Hall, UC Berkeley, where the job control details were greatly modified but the structure definitions and names remained essentially unchanged. The second interpretation of the 'l' in lflag is ``line discipline flag'' which corresponds to the c_lflag of the termios structure.

isig (-isig)
	Enable (disable) the checking of characters against the special control characters `INTR, QUIT`, and `SUSP`.
icanon (-icanon)
	Enable (disable) canonical input ( `ERASE` and `KILL` processing).
iexten (-iexten)
	Enable (disable) any implementation defined special control characters not currently controlled by icanon, isig, or ixon.
echo (-echo)
	Echo back (do not echo back) every character typed.
echoe (-echoe)
	The `ERASE` character shall (shall not) visually erase the last character in the current line from the display, if possible.
echok (-echok)
	Echo (do not echo) `NL` after `KILL` character.
echoke (-echoke)
	The `KILL` character shall (shall not) visually erase the current line from the display, if possible.
echonl (-echonl)
	Echo (do not echo) `NL`, even if echo is disabled.
echoctl (-echoctl)
	If echoctl is set, echo control characters as ^X. Otherwise control characters echo as themselves.
echoprt (-echoprt)
	For printing terminals. If set, echo erased characters backwards within ``\'' and ``/''. Otherwise, disable this feature.
noflsh (-noflsh)
	Disable (enable) flush after `INTR, QUIT, SUSP`.
tostop (-tostop)
	Send (do not send) `SIGTTOU` for background output. This causes background jobs to stop if they attempt terminal output.
altwerase (-altwerase)
	Use (do not use) an alternate word erase algorithm when processing `WERASE` characters. This alternate algorithm considers sequences of alphanumeric/underscores as words. It also skips the first preceding character in its classification (as a convenience since the one preceding character could have been erased with simply an `ERASE` character.)
mdmbuf (-mdmbuf)
	If set, flow control output based on condition of Carrier Detect. Otherwise writes return an error if Carrier Detect is low (and Carrier is not being ignored with the `CLOCAL` flag.)
flusho (-flusho)
	Indicates output is (is not) being discarded.
pendin (-pendin)
	Indicates input is (is not) pending after a switch from non-canonical to canonical mode and will be re-input when a read becomes pending or more input arrives.

-a
	Display all the current settings for the terminal to standard output as per IEEE Std 1003.2 ("POSIX.2").
-e
	Display all the current settings for the terminal to standard output in the traditional BSD ``all'' and ``everything'' formats.
-f
	Open and use the terminal named by file rather than using standard input. The file is opened using the `O_NONBLOCK` flag of `open()`, making it possible to set or display settings on a terminal that might otherwise block on the open.
-g
	Display all the current settings for the terminal to standard output in a form that may be used as an argument to a subsequent invocation of stty to restore the current terminal state as per IEEE Std 1003.2 ("POSIX.2").

parenb (-parenb)
	Enable (disable) parity generation and detection.
parodd (-parodd)
	Select odd (even) parity.
cs5 cs6 cs7 cs8
	Select character size, if possible.
number
	Set terminal baud rate to the number given, if possible. If the baud rate is set to zero, modem control is no longer asserted.
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 is set to the value of the output baud rate.
ospeed number
	Set terminal output baud rate to the number given, if possible. If the output baud rate is set to zero, modem control is no longer asserted.
speed number
	This sets both ispeed and ospeed to number.
hupcl (-hupcl)
	Stop asserting modem control (do not stop asserting modem control) on last close.
hup (-hup)
	Same as hupcl (-hupcl).
cstopb (-cstopb)
	Use two (one) stop bits per character.
cread (-cread)
	Enable (disable) the receiver.
clocal (-clocal)
	Assume a line without (with) modem control.
crtscts (-crtscts)
	Enable (disable) RTS/CTS flow control.

ignbrk (-ignbrk)
	Ignore (do not ignore) break on input.
brkint (-brkint)
	Signal (do not signal) `INTR` on break.
ignpar (-ignpar)
	Ignore (do not ignore) characters with parity errors.
parmrk (-parmrk)
	Mark (do not mark) characters with parity errors.
inpck (-inpck)
	Enable (disable) input parity checking.
istrip (-istrip)
	Strip (do not strip) input characters to seven bits.
inlcr (-inlcr)
	Map (do not map) `NL` to `CR` on input.
igncr (-igncr)
	Ignore (do not ignore) `CR` on input.
icrnl (-icrnl)
	Map (do not map) `CR` to `NL` on input.
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`, or if ixany is set, any character restarts output.
ixoff (-ixoff)
	Request that the system send (not send) `START/STOP` characters when the input queue is nearly empty/full.
ixany (-ixany)
	Allow any character (allow only `START`) to restart output.
imaxbel (-imaxbel)
	The system imposes a limit of `MAX_INPUT` (currently 255) characters in the input queue. If imaxbel is set and the input queue limit has been reached, subsequent input causes the system to send an ASCII BEL character to the output queue (the terminal beeps at you). Otherwise, if imaxbel is unset and the input queue is full, the next input character causes the entire input and output queues to be discarded.

opost (-opost)
	Post-process output (do not post-process output; ignore all other output modes).
onlcr (-onlcr)
	Map (do not map) `NL` to `CR-NL` on output.
ocrnl (-ocrnl)
	Map (do not map) `CR` to `NL` on output.
tab0 tab3
	Select tab expansion policy. tab0 disables tab expansion, while tab3 enables it.
onocr (-onocr)
	Do not (do) output CRs at column zero.
onlret (-onlret)
	On the terminal NL performs (does not perform) the CR function.

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 -, -oddp
	Disable parenb, and set cs8.
amp;nl (-amp;nl)
	Enable (disable) icrnl. In addition -nl unsets inlcr and igncr.
ek	Reset `ERASE`, `ERASE2`, and `KILL` characters back to system defaults.
sane	Resets all modes to reasonable values for interactive terminal use.
tty	Set the line discipline to the standard terminal line discipline `TTYDISC`.
crt (-crt)
	Set (disable) all modes suitable for a CRT display device.
kerninfo (-kerninfo)
	Enable (disable) the system generated status line associated with processing a `STATUS` character (usually set to ^T). The status line consists of the system load average, the current command name, its process ID, the event the process is waiting on (or the status of the process), the user and system times, percent cpu, and current memory usage.
columns number
	The terminal size is recorded as having number columns.
cols number
	is an alias for columns.
rows number
	The terminal size is recorded as having number rows.
dec	Set modes suitable for users of Digital Equipment Corporation systems `( ERASE`, `KILL`, and `INTR` characters are set to ^?, ^U, and ^C; `ixany` is disabled, and `crt` is enabled.)
extproc (-extproc)
	If set, this flag indicates that some amount of terminal processing is being performed by either the terminal hardware or by the remote side connected to a pty.
raw (-raw)
	If set, change the modes of the terminal so that no input or output processing is performed. If unset, change the modes of the terminal to some reasonable state that performs input and output processing. Note that since the terminal driver no longer has a single `RAW` bit, it is not possible to intuit what flags were set prior to setting raw. This means that unsetting raw may not put back all the setting that were previously in effect. To set the terminal into a raw state and then accurately restore it, the following shell code is recommended: save_state=$(stty -g) stty raw amp;... stty "$save_state"
size	The size of the terminal is printed as two numbers on a single line, first rows, then columns.

Manual Pages — STTY

NAME

CONTENTS

SYNOPSIS

DESCRIPTION

Control Modes:

Input Modes:

Output Modes:

Local Modes:

Control Characters:

Combination Modes:

Compatibility Modes:

EXIT STATUS

SEE ALSO

STANDARDS

HISTORY

all	Reports all the terminal modes as with stty -a except that the control characters are printed in a columnar format.
everything
	Same as all.
cooked
	Same as sane.
cbreak
	If set, enables brkint, ixon, imaxbel, opost, isig, iexten, and -icanon. If unset, same as sane.
new	Same as tty.
old	Same as tty.
newcrt (-newcrt)
	Same as crt.
pass8	The converse of parity.
tandem (-tandem)
	Same as ixoff.
decctlq (-decctlq)
	The converse of ixany.
crterase (-crterase)
	Same as echoe.
crtbs (-crtbs)
	Same as echoe.
crtkill (-crtkill)
	Same as echoke.
ctlecho (-ctlecho)
	Same as echoctl.
prterase (-prterase)
	Same as echoprt.
litout (-litout)
	The converse of opost.
oxtabs (-oxtabs)
	Expand (do not expand) tabs to spaces on output.
tabs (-tabs)
	The converse of oxtabs.
brk value
	Same as the control character eol.
flush value
	Same as the control character discard.
rprnt value
	Same as the control character reprint.

“	… one of the main causes of the fall of the Roman Empire was that, lacking zero, they had no way to indicate successful termination of their C programs.	”
— Robert Firth