man/man1/ov.1

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NAME            ov -- overlay pages
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SYNOPSIS        ov\b\b__ [ file ]
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DESCRIPTION     ov\b\b__
is a postprocessor for producing double column formatted
text when using nroff(I).
ov\b\b__
literally overlays successive pairs of 66-line pages.

If the file argument is missing,
the standard input is used.
Thus ov\b\b__ may be used as a filter.
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FILES           none
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SEE ALSO        nroff(I), pr(I)
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DIAGNOSTICS     none
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BUGS            Other page lengths should be permitted.