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Man page of units
units
Section: User Commands (1)
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NAME
units  Converts units from one measure to another
SYNOPSIS
units [] [file]
DESCRIPTION
The
units
command converts quantities expressed in
one measurement to their equivalents in another. The
units
command is an interactive command. It prompts you for the unit you want to
convert from and the unit you want to convert to. The
units
command does multiplicative scale changes only. That is,
units
can convert from one value to another only when the conversion is done with
a multiplication factor. For example,
units
cannot convert
between degrees Fahrenheit and degrees Celsius because the value of 32 must
be added or subtracted in the conversion.
You can specify a quantity as a multiplicative combination of units,
optionally preceded by a numeric multiplier.
Indicate powers by entering suffixed positive integers and indicate
division with a
/
(slash).
The
units
command recognizes
lb
as a unit of mass, but considers
pound
to be the British
pound sterling. Compound names are run together (for example,
lightyear). Prefix British units differing from their American
counterparts with
br
(for example,
brgallon).
The
/usr/share/lib/units
file contains a complete list
of the units that the
units
command uses.
Most familiar units, abbreviations, and metric prefixes are recognized
by the
units
command, together with the following:
Ratio of circumference to diameter.
Speed of light.
Charge on an electron.
Acceleration of gravity.
Same as
g.
Avogadro's number.
Pressure head per unit height of water.
Astronomical unit.
The

argument causes
units
to
display a list of all known units and their conversion values. The
file
argument specifies an alternative
units
file to be used instead of the default file
units.
EXAMPLES
To start the
units
command, enter:
units
Now you can try the following examples.
To display conversion factors, enter:
you have: in
you want: cm
* 2.540000e+00
/ 3.937008e01

The output from the
units
command tells you to multiply
the number of inches by 2.540000e+00 to get centimeters, and to multiply the
number of centimeters by 3.937008e01 to get inches.

These numbers are in standard exponential notation, so 3.937008e01
means 3.937008 x 101, which is the same as 0.3937008. The second number
is always the reciprocal of the first; for example, 2.54 equals 1/0.3937008.
To convert a measurement to different units, enter:
you have: 5 years
you want: microsec
* 1.577846e+14
/ 6.337753e15

The output shows that 5 years equals 1.577846 x 1014 microseconds, and
that 1 microsecond equals 6.337753 x 1015 years.
To give fractions in measurements, enter:
you have: 13 mi
you want: km
* 5.364480e01
/ 1.864114e+00

The

(vertical bar) indicates division, so 13 means
onethird. This shows that onethird mile is the same as 0.536448 kilometers.
To include exponents in measurements, enter:
you have: 1.25 gal
you want: floz
* 1.536000e03
/ 6.510417e+02

The expression 1.25 gal is the equivalent of 1.2 x 105. Do not type
an e before the exponent. This example shows that 1.2 x 105 (0.000012) gallons
equal 1.536 x 103 (0.001536) fluid ounces.
To specify complex units, enter:
you have: gram centimeter/second2
you want: kgm/sec2
* 1.000000e05
/ 1.000000e+05

The units gram centimeter/second2 mean "grams x centimeters/second2."
Similarly, kgm/sec2 means "kilograms x meters/sec2," which is often read
as "kilogrammeters per seconds squared".
If the units you specify after you have and you want are incompatible,
enter:
you have: ft
you want: lb
conformability
3.048000e01 m
4.535924e01 kg

The message
conformability
means the units you specified
cannot be converted. Feet measure length, and pounds measure mass, so converting
from one to the other does not make sense. Therefore, the
units
command displays the equivalent of each value in standard units.

In other words, this example shows that 1 foot equals 0.3048 meters
and that 1 pound equals 0.4535924 kilograms. The
units
command shows the equivalents in meters and kilograms because the command
considers these units to be standard measures of length and mass.

Entering
<Ctrld>
causes you to exit from the
units
program.
FILES
Contains units and their conversion values.
Index
 NAME

 SYNOPSIS

 DESCRIPTION

 EXAMPLES

 FILES

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Time: 02:43:05 GMT, October 02, 2010