`stty': Print or change terminal characteristics
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`stty' prints or changes terminal characteristics, such as baud rate.
Synopses:
stty [OPTION] [SETTING]...
stty [OPTION]
If given no line settings, `stty' prints the baud rate, line
discipline number (on systems that support it), and line settings that
have been changed from the values set by `stty sane'. By default, mode
reading and setting are performed on the tty line connected to standard
input, although this can be modified by the `--file' option.
`stty' accepts many non-option arguments that change aspects of the
terminal line operation, as described below.
The program accepts the following options. Also see Note:Common
options.
`-a'
`--all'
Print all current settings in human-readable form. This option
may not be used in combination with any line settings.
`-F DEVICE'
`--file=DEVICE'
Set the line opened by the filename specified in DEVICE instead of
the tty line connected to standard input. This option is necessary
because opening a POSIX tty requires use of the `O_NONDELAY' flag
to prevent a POSIX tty from blocking until the carrier detect line
is high if the `clocal' flag is not set. Hence, it is not always
possible to allow the shell to open the device in the traditional
manner.
`-g'
`--save'
Print all current settings in a form that can be used as an
argument to another `stty' command to restore the current
settings. This option may not be used in combination with any
line settings.
Many settings can be turned off by preceding them with a `-'. Such
arguments are marked below with "May be negated" in their description.
The descriptions themselves refer to the positive case, that is, when
_not_ negated (unless stated otherwise, of course).
Some settings are not available on all POSIX systems, since they use
extensions. Such arguments are marked below with "Non-POSIX" in their
description. On non-POSIX systems, those or other settings also may not
be available, but it's not feasible to document all the variations: just
try it and see.