s the position of the viewport in the buffer
and how much of the buffer is covered by the viewport.
</p>
</dd>
<dt><samp>-r <var>number</var></samp></dt>
<dt><samp>--fill=<var>number</var></samp></dt>
<dd><p>Set the target width for justifying and automatic hard-wrapping at this
<var>number</var> of columns.  If the value is 0 or less, wrapping will occur
at the width of the screen minus <var>number</var> columns, allowing the wrap
point to vary along with the width of the screen if the screen is resized.
T