Document the two new sysctl variables introduced in rev 1.154 of tty.c.
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@ -393,6 +393,16 @@ in
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.Fa state
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is cleared in the terminal.
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.El
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.Sh IMPLEMENTATION NOTES
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The total number of input and output bytes
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through all terminal devices
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are available via the
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.Va kern.tk_nin
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and
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.Va kern.tk_nout
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read-only
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.Xr sysctl 8
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variables.
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.Sh SEE ALSO
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.Xr stty 1 ,
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.Xr ioctl 2 ,
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