coreutils: stty invocation

1 
1 19.2 ‘stty’: Print or change terminal characteristics
1 =====================================================
1 
1 ‘stty’ prints or changes terminal characteristics, such as baud rate.
1 Synopses:
1 
1      stty [OPTION] [SETTING]...
1      stty [OPTION]
1 
1    If given no line settings, ‘stty’ prints the baud rate, line
1 discipline number (on systems that support it), and line settings that
1 have been changed from the values set by ‘stty sane’.  By default, mode
1 reading and setting are performed on the tty line connected to standard
1 input, although this can be modified by the ‘--file’ option.
1 
1    ‘stty’ accepts many non-option arguments that change aspects of the
1 terminal line operation, as described below.
1 
11    The program accepts the following options.  Also see ⇒Common
 options.
1 
1 ‘-a’
1 ‘--all’
1      Print all current settings in human-readable form.  This option may
1      not be used in combination with any line settings.
1 
1 ‘-F DEVICE’
1 ‘--file=DEVICE’
1      Set the line opened by the file name specified in DEVICE instead of
1      the tty line connected to standard input.  This option is necessary
1      because opening a POSIX tty requires use of the ‘O_NONDELAY’ flag
1      to prevent a POSIX tty from blocking until the carrier detect line
1      is high if the ‘clocal’ flag is not set.  Hence, it is not always
1      possible to allow the shell to open the device in the traditional
1      manner.
1 
1 ‘-g’
1 ‘--save’
1      Print all current settings in a form that can be used as an
1      argument to another ‘stty’ command to restore the current settings.
1      This option may not be used in combination with any line settings.
1 
1    Many settings can be turned off by preceding them with a ‘-’.  Such
1 arguments are marked below with “May be negated” in their description.
1 The descriptions themselves refer to the positive case, that is, when
1 _not_ negated (unless stated otherwise, of course).
1 
1    Some settings are not available on all POSIX systems, since they use
1 extensions.  Such arguments are marked below with “Non-POSIX” in their
1 description.  On non-POSIX systems, those or other settings also may not
1 be available, but it’s not feasible to document all the variations: just
1 try it and see.
1 
1    ‘stty’ is installed only on platforms with the POSIX terminal
1 interface, so portable scripts should not rely on its existence on
1 non-POSIX platforms.
1 
1    An exit status of zero indicates success, and a nonzero value
1 indicates failure.
1 

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