Gnu/coreutils/stty-invocation
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19.2 stty
: Print or change terminal characteristics
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 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 theO_NONDELAY
flag to prevent a POSIX tty from blocking until the carrier detect line is high if theclocal
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.
• Control | Control settings | |
• Input | Input settings | |
• Output | Output settings | |
• Local | Local settings | |
• Combination | Combination settings | |
• Characters | Special characters | |
• Special | Special settings |
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