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Diff for /src/usr.bin/units/units.1 between version 1.9 and 1.10

version 1.9, 1999/06/13 16:31:18 version 1.10, 2000/03/14 14:58:24
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 .Op Fl v  .Op Fl v
 .Ar from-unit  .Ar from-unit
 .Ar to-unit  .Ar to-unit
 .Sh ARGUMENTS  
 .Bl -tag -width Ds  
 .It Fl f Ar filename  
 Specifies the name of the units data file to load.  
 .It Fl q  
 Suppresses prompting of the user for units and the display of statistics  
 about the number of units loaded.  
 .It Fl v  
 Prints the version number.  
 .It Ar from-unit Ar to-unit  
 Allows a single unit conversion to be done directly from the command  
 line.  No prompting will occur.  The units program will print out  
 only the result of this single conversion.  
 .El  
 .Sh DESCRIPTION  .Sh DESCRIPTION
 The units program converts quantities expression in various scales to  The
 their equivalents in other scales.  The units program can only  .Nm
 handle multiplicative scale changes.  It cannot convert Celsius  program converts quantities expression in various scales to
 to Fahrenheit, for example.  It works interactively by prompting  their equivalents in other scales.
 the user for input:  The
   .Nm
   program can only handle multiplicative scale changes.
   It cannot convert Celsius
   to Fahrenheit, for example.
   It works interactively by prompting the user for input:
 .Pp  .Pp
 .nf  .nf
     You have: meters      You have: meters
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             / 3785.4118              / 3785.4118
 .fi  .fi
 .Pp  .Pp
   The options are as follows:
   .Bl -tag -width Ds
   .It Fl f Ar filename
   Specifies the name of the units data file to load.
   .It Fl q
   Suppresses prompting of the user for units and the display of statistics
   about the number of units loaded.
   .It Fl v
   Prints the version number.
   .It Ar from-unit Ar to-unit
   Allows a single unit conversion to be done directly from the command line.
   No prompting will occur.
   The units program will print out
   only the result of this single conversion.
   .El
   .Pp
 Powers of units can be specified using the  Powers of units can be specified using the
 .Ql ^  .Ql ^
 character as shown in  character as shown in
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 is equivalent to  is equivalent to
 .Sq cm^3 .  .Sq cm^3 .
 Multiplication of units can be specified by using spaces, a dash or  Multiplication of units can be specified by using spaces, a dash or
 an asterisk.  Division of units is indicated by the slash  an asterisk.
   Division of units is indicated by the slash
 .Pq Ql / .  .Pq Ql / .
 Note that multiplication has a higher precedence than division, so  Note that multiplication has a higher precedence than division, so
 .Sq m/s/s  .Sq m/s/s
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             2.1166667e-05 kg^2 m / sec              2.1166667e-05 kg^2 m / sec
 .fi  .fi
 .Pp  .Pp
 The conversion information is read from a units data file.  The default  The conversion information is read from a units data file.
 file includes definitions for most familiar units, abbreviations and  The default file includes definitions for most familiar units,
 metric prefixes.  Some constants of nature included are:  abbreviations and metric prefixes.
   Some constants of nature included are:
 .Bl -tag -width mercury  .Bl -tag -width mercury
 .It pi  .It pi
 ratio of circumference to diameter  ratio of circumference to diameter
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 .El  .El
 .Pp  .Pp
 .Sq Pound  .Sq Pound
 is a unit of mass.  Compound names are run together  is a unit of mass.
 so  Compound names are run together so
 .Sq poundforce  .Sq poundforce
 is a unit of force.  British units that differ from their  is a unit of force.
 US counterparts are prefixed with  British units that differ from their US counterparts are prefixed with
 .Sq br ,  .Sq br ,
 and currency is prefixed with its country name:  and currency is prefixed with its country name:
 .Sq belgiumfranc ,  .Sq belgiumfranc ,
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 and check again for a match.  and check again for a match.
 .Pp  .Pp
 All of these definitions can be read in the standard units file, or you  All of these definitions can be read in the standard units file, or you
 can supply your own file.  A unit is specified on a single line by  can supply your own file.
 giving its name and an equivalence.  One should be careful to define  A unit is specified on a single line by
   giving its name and an equivalence.
   One should be careful to define
 new units in terms of old ones so that a reduction leads to the  new units in terms of old ones so that a reduction leads to the
 primitive units which are marked with  primitive units which are marked with
 .Ql !  .Ql !
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 by careless unit definitions.  by careless unit definitions.
 .Pp  .Pp
 Prefixes are defined in the same way as standard units, but with  Prefixes are defined in the same way as standard units, but with
 a trailing dash at the end of the prefix name.  Prefixes are applied  a trailing dash at the end of the prefix name.
   Prefixes are applied
 after the longest matching unit name is found; for example,  after the longest matching unit name is found; for example,
 .Dq nmile  .Dq nmile
 is taken to be a nautical mile rather than a nanomile.  is taken to be a nautical mile rather than a nanomile.
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 Exponents of units entered by the user can be only one digit.  Exponents of units entered by the user can be only one digit.
 You can work around this by multiplying several terms.  You can work around this by multiplying several terms.
 .Pp  .Pp
 The user must use | to indicate division of numbers and / to  The user must use
 indicate division of symbols.  This distinction should not  .Ql |
 be necessary.  to indicate division of numbers and
   .Ql /
   to indicate division of symbols.
   This distinction should not be necessary.
 .Pp  .Pp
 Prefixes specified without a unit are treated as dimensionless quantities.  Prefixes specified without a unit are treated as dimensionless quantities.
 This can lead to confusion when some prefixes are also defined as units  This can lead to confusion when some prefixes are also defined as units
 (e.g., m).  For example, Tera- / Giga- is 1000, but one Tesla (T) is 10,000  (e.g., m).
   For example, Tera- / Giga- is 1000, but one Tesla (T) is 10,000
 Gauss (G).  Gauss (G).
 .Pp  .Pp
 Some non-SI units have multiple definitions (e.g, barrel, calorie) and  Some non-SI units have multiple definitions (e.g, barrel, calorie) and
 others have changed over time (e.g., cubit).  In particular, monetary  others have changed over time (e.g., cubit).
 values fluctuate.  In particular, monetary values fluctuate.
 .Pp  .Pp
 The program contains various arbitrary limits on the length  The program contains various arbitrary limits on the length
 of the units converted and on the length of the data file.  of the units converted and on the length of the data file.
Legend:
Removed from v.1.9  
changed lines
  Added in v.1.10