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<head>
<title>units(1) - Plan 9 from User Space</title>
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<tr><td width=20><td><b>UNITS(1)</b><td align=right><b>UNITS(1)</b>
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<br>
<p><font size=+1><b>NAME </b></font><br>
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units – conversion program<br>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<tt><font size=+1>units</font></tt> [ <tt><font size=+1>−v</font></tt> ] [ <i>file</i> ]<br>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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<i>Units</i> converts quantities expressed in various standard scales
to their equivalents in other scales. It works interactively in
this fashion:<br>
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<tt><font size=+1>you have: inch<br>
you want: cm<br>
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* 2.54<br>
/ 0.393701<br>
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</font></tt>
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A quantity is specified as a multiplicative combination of units
and floating point numbers. Operators have the following precedence:<br>
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<tt><font size=+1>+ − </font></tt> add and subtract<br>
<tt><font size=+1>* / x ÷ </font></tt> multiply and divide<br>
catenation multiply<br>
<tt><font size=+1>² ³ ^ </font></tt> exponentiation<br>
<tt><font size=+1>| </font></tt> divide<br>
<tt><font size=+1>(</font></tt> ... <tt><font size=+1>) </font></tt> grouping<br>
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Most familiar units, abbreviations, and metric prefixes are recognized,
together with a generous leavening of exotica and a few constants
of nature including:<br>
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<tt><font size=+1>pi,</font></tt>π ratio of circumference to diameter<br>
<tt><font size=+1>c </font></tt> speed of light <br>
<tt><font size=+1>e </font></tt> charge on an electron <br>
<tt><font size=+1>g </font></tt> acceleration of gravity <br>
<tt><font size=+1>force </font></tt> same as <tt><font size=+1>g <br>
mole </font></tt> Avogadro’s number <br>
<tt><font size=+1>water </font></tt> pressure head per unit height of water <br>
<tt><font size=+1>au </font></tt> astronomical unit <br>
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The <tt><font size=+1>pound</font></tt> is a unit of mass. Compound names are run together,
e.g. <tt><font size=+1>lightyear</font></tt>. British units that differ from their US counterparts
are prefixed thus: <tt><font size=+1>brgallon</font></tt>. Currency is denoted <tt><font size=+1>belgiumfranc</font></tt>,
<tt><font size=+1>britainpound</font></tt>, etc.
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The complete list of units can be found in <tt><font size=+1>/usr/local/plan9/lib/units</font></tt>.
A <i>file</i> argument to <i>units</i> specifies a file to be used instead of
<tt><font size=+1>/usr/local/plan9/lib/units.</font></tt> The <tt><font size=+1>−v</font></tt> flag causes <i>units</i> to print
its entire database.<br>
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<p><font size=+1><b>EXAMPLE </b></font><br>
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<tt><font size=+1>you have: 15 pounds force/in²<br>
you want: atm<br>
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* 1.02069<br>
/ .97973<br>
</table>
</font></tt>
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<p><font size=+1><b>FILES </b></font><br>
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<tt><font size=+1>/usr/local/plan9/lib/units<br>
</font></tt>
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<p><font size=+1><b>SOURCE </b></font><br>
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<tt><font size=+1>/usr/local/plan9/src/cmd/units.y<br>
</font></tt>
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<p><font size=+1><b>BUGS </b></font><br>
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Since <i>units</i> does only multiplicative scale changes, it can convert
Kelvin to Rankine but not Centigrade to Fahrenheit.
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Currency conversions are only as accurate as the last time someone
updated the database.<br>
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