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ttyctl
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1993-10-09
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ttyctl -fu
The -f option freezes the tty, and -u unfreezes it.
When the tty is frozen, no changes made to the tty
settings by external programs will be honored by
the shell, except for changes in the size of the
screen; the shell will simply reset the settings to
their previous values as soon as each command exits
or is suspended. Thus, stty and similar programs
have no effect when the tty is frozen. Without
options it reports whether the terminal is frozen
or not.