File: coreutils.info,  Node: stty invocation,  Next: printenv invocation,  Prev: pwd invocation,  Up: Working context

19.2 ‘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 file name 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.

   ‘stty’ is installed only on platforms with the POSIX terminal
interface, so portable scripts should not rely on its existence on
non-POSIX platforms.

   An exit status of zero indicates success, and a nonzero value
indicates failure.

* Menu:

* Control::                     Control settings
* Input::                       Input settings
* Output::                      Output settings
* Local::                       Local settings
* Combination::                 Combination settings
* Characters::                  Special characters
* Special::                     Special settings