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==Converting data with units== This short tutorial shows you how to use the units command which is a nifty utility that converts quantities between scales (e.g. meters to feet or kilograms to pounds). While not an essential tool, it can certainly be convenient at times. Code Listing 1: Getting units # emerge app-sci/units or apt-get install units or ... There are two ways to use the units command, interactively and non-interactively. To use it interactively, simply issue the command units. Code Listing 2: Using units interactively % units 1948 units, 71 prefixes, 28 functions You have: 1 meter You want: feet * 3.2808399 / 0.3048 You have: 3 kilograms You want: pounds * 6.6138679 / 0.15119746 The first number (prefixed by a *) indicates the conversion as you specified (i.e. there are about 3.28 feet in a meter). The second number is the conversion in the opposite direction (i.e. there are about 0.3 meters in a foot). To use units non-interactively, issue the command followed by the original expression and then the new expression. Code Listing 3: Using units non-interactively // How many pecks are in a bushel? % units '1 bushel' 'peck' * 4 / 0.25 // How many miles per hour are in a knot? % units '1 knot' 'mph' * 1.1507794 / 0.86897624 Note: A 'knot' is one nautical mile per hour. See the man page (man units) for more information on the units command. From http://www.gentoo.org/news/en/gwn/20030825-newsletter.xml
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