 Index Entry   Section 

!   
 ‘!’ to indicate primitive units:   Defining New Units 
 ‘!endlocale’:   Localization 
 ‘!endutf8’:   Unicode Support 
 ‘!include’:   Units Data Files 
 ‘!locale’:   Localization 
 ‘!unitlist’:   Defining Unit List Aliases 
 ‘!utf8’:   Unicode Support 

*   
 ‘*’ operator:   Operators 
 ‘**’ operator:   Operators 

+   
 ‘+’ operator:   Sums and Differences of Units 

   
 ‘’ as multiplication operator:   Backwards Compatibility 
 ‘’ as subtraction operator:   Sums and Differences of Units 
 check (option for units ) :   Invoking Units 
 checkverbose (option for units ) :   Invoking Units 
 compact (option for units ) :   Invoking Units 
 digits (option for units ) :   Invoking Units 
 exponential (option for units ) :   Invoking Units 
 file (option for units ) :   Invoking Units 
 file (option for units ) :   Invoking Units 
 help (option for units ) :   Invoking Units 
 info (option for units ) :   Invoking Units 
 locale (option for units ) :   Invoking Units 
 log (option for units ) :   Invoking Units 
 minus (option for units ) :   Invoking Units 
 newstar (option for units ) :   Invoking Units 
 oldstar (option for units ) :   Invoking Units 
 oneline (option for units ) :   Invoking Units 
 outputformat (option for units ) :   Invoking Units 
 product (option for units ) :   Invoking Units 
 quiet (option for units ) :   Invoking Units 
 silent (option for units ) :   Invoking Units 
 strict (option for units ) :   Invoking Units 
 terse (option for units ) :   Invoking Units 
 unitsfile (option for units ) :   Invoking Units 
 verbose (option for units ) :   Invoking Units 
 verbosecheck (option for units ) :   Invoking Units 
 version (option for units ) :   Invoking Units 
 1 (option for units ) :   Invoking Units 
 c (option for units ) :   Invoking Units 
 d (option for units ) :   Invoking Units 
 e (option for units ) :   Invoking Units 
 f (option for units ) :   Invoking Units 
 f (option for units ) :   Invoking Units 
 h (option for units ) :   Invoking Units 
 I (option for units ) :   Invoking Units 
 L (option for units ) :   Invoking Units 
 l (option for units ) :   Invoking Units 
 m (option for units ) :   Invoking Units 
 o (option for units ) :   Invoking Units 
 p (option for units ) :   Invoking Units 
 q (option for units ) :   Invoking Units 
 s (option for units ) :   Invoking Units 
 t (option for units ) :   Invoking Units 
 U (option for units ) :   Invoking Units 
 v (option for units ) :   Invoking Units 
 V (option for units ) :   Invoking Units 

?   
 ‘?’ for unit completion with readline :   Readline Support 
 ‘?’ to show conformable units:   Interactive Use 

_   
 ‘_’ to use result of previous conversion:   Previous Result 

   
 ‘’ operator:   Operators 

A   
 abrasive grit size:   Other Nonlinear Units 
 addition of units:   Sums and Differences of Units 
 additional units data files:   Units Data Files 

B   
 backwards compatibility:   Backwards Compatibility 
 British Imperial measure:   Unit Definitions 

C   
 circle, area of:   Other Nonlinear Units 
 command, ‘!’ to indicate primitive units:   Defining New Units 
 command, ‘!endlocale’:   Localization 
 command, ‘!endutf8’:   Unicode Support 
 command, ‘!endvar’:   Localization 
 command, ‘!include’:   Units Data Files 
 command, ‘!locale’:   Localization 
 command, ‘!message’:   Localization 
 command, ‘!set’:   Localization 
 command, ‘!unitlist’:   Defining Unit List Aliases 
 command, ‘!utf8’:   Unicode Support 
 command, ‘!var’:   Localization 
 command, ‘!varnot’:   Localization 
 commandline options:   Invoking Units 
 commandline unit conversion:   Command Line Use 
 commands in units database:   Database Syntax 
 compatibility:   Backwards Compatibility 
 compatibility with earlier versions:   Backwards Compatibility 
 completion, unit, using ‘?’ (readline only):   Readline Support 
 conformable units, ‘?’ to show:   Interactive Use 
 currency, updating:   Currency 

D   
 Darcy–Weisbach equation:   Complicated Unit Expressions 
 data files:   Data Files 
 data files, additional:   Units Data Files 
 database syntax summary:   Database Syntax 
 defining nonlinear units:   Defining Nonlinear Units 
 defining piecewise linear units:   Piecewise Linear Units 
 defining prefixes:   Defining New Units 
 defining unit list aliases:   Defining Unit List Aliases 
 defining units:   Defining New Units 
 defining units with ‘’:   Backwards Compatibility 
 differences of units:   Sums and Differences of Units 
 dimensionless units:   Interactive Use 
 dimensionless units, defining:   Defining New Units 
 division of numbers:   Operators 
 division of units:   Operators 
 domain, nonlinear unit definitions:   Defining Nonlinear Units 

E   
 environment dependent definitions:   Localization 
 environment variable, HOME:   Environment Vars 
 environment variable, LANG:   Environment Vars 
 environment variable, LC_CTYPE:   Environment Vars 
 environment variable, MYUNITSFILE:   Units Data Files 
 environment variable, MYUNITSFILE:   Environment Vars 
 environment variable, PAGER:   Environment Vars 
 environment variable, UNITSFILE:   Environment Vars 
 environment variable, UNITSLOCALEMAP:   Environment Vars 
 environment variable, UNITS_ENGLISH:   Environment Vars 
 environment variables:   Environment Vars 
 exchange rates, updating:   Currency 
 exponent operator:   Operators 

F   
 files, data:   Data Files 
 flags, output format:   Flags 
 format specification, output:   Format Specification 
 fractions, numerical:   Operators 
 functions of units:   Defining Nonlinear Units 
 functions, built in:   Builtin Functions 

H   
 help:   Interactive Use 
 help:   Environment Vars 
 HOME environment variable:   Environment Vars 
 hyphen as multiplication operator:   Backwards Compatibility 

I   
 Imperial measure:   Unit Definitions 
 include files:   Defining New Units 
 including additional units data files:   Units Data Files 
 incompatible units:   Interactive Use 
 interactive use:   Interactive Use 
 international mile:   Unit Definitions 
 international yard:   Unit Definitions 
 invoking units:   Invoking Units 

L   
 LANG environment variable:   Environment Vars 
 LC_CTYPE environment variable:   Environment Vars 
 length measure, English customary:   Unit Definitions 
 length measure, UK:   Unit Definitions 
 linear interpolation:   Piecewise Linear Units 
 locale:   Locale 
 locale_map.txt:   Locale 
 localization:   Localization 
 log file:   Logging Calculations 
 logging calculations:   Logging Calculations 

M   
 measure, Imperial:   Unit Definitions 
 mile, international:   Unit Definitions 
 minus (‘’) operator, subtraction:   Sums and Differences of Units 
 multiplication of units:   Operators 
 multiplication, hyphen:   Backwards Compatibility 
 MYUNITSFILE environment variable:   Units Data Files 
 MYUNITSFILE environment variable:   Environment Vars 

N   
 nonconformable units:   Interactive Use 
 noninteractive unit conversion:   Command Line Use 
 nonlinear unit conversions:   Nonlinear Conversions 
 nonlinear unit conversions:   Defining Nonlinear Units 
 nonlinear units, defining:   Defining Nonlinear Units 
 nonlinear units, other:   Other Nonlinear Units 
 numbers as units:   Numbers as Units 
 numeric output format:   Numeric Output Format 
 numerical fractions:   Operators 

O   
 operator precedence:   Operators 
 operator, (‘**’):   Operators 
 operator, caret (‘^’):   Operators 
 operator, hyphen (‘’) as multiplication:   Backwards Compatibility 
 operator, hyphen (‘’) as subtraction:   Sums and Differences of Units 
 operator, minus (‘’):   Sums and Differences of Units 
 operator, ‘per’:   Operators 
 operator, plus (‘+’):   Sums and Differences of Units 
 operator, slash (‘/’):   Operators 
 operator, solidus (‘/’):   Operators 
 operator, space:   Operators 
 operator, star (‘*’):   Operators 
 operator, vertical bar (‘’):   Operators 
 operators:   Operators 
 output field width:   Field Width 
 output format:   Numeric Output Format 
 output format flags:   Flags 
 output format specification:   Format Specification 
 output precision:   Precision 

P   
 PAGER environment variable:   Environment Vars 
 parentheses:   Operators 
 parentheses:   Operators 
 parentheses:   Operators 
 parentheses:   Sums and Differences of Units 
 parentheses:   Complicated Unit Expressions 
 parentheses:   Defining New Units 
 parentheses:   Defining New Units 
 parentheses:   Defining Nonlinear Units 
 ‘per’ operator:   Operators 
 personal units data file:   Units Data Files 
 piecewise linear units:   Piecewise Linear Units 
 plus (‘+’) operator:   Sums and Differences of Units 
 powers:   Operators 
 precision, output:   Precision 
 prefixes:   Unit Definitions 
 prefixes and exponents:   Operators 
 prefixes, definition of:   Defining New Units 
 previous result:   Previous Result 
 primitive units:   Defining New Units 
 products of units:   Operators 

Q   
 quotients of units:   Operators 

R   
 range, nonlinear unit definitions:   Defining Nonlinear Units 
 readline , use with units :   Readline Support 
 reciprocal conversion:   Interactive Use 
 roots:   Builtin Functions 

S   
 setlocale function:   Locale 
 slash (‘/’) operator:   Operators 
 solidus (‘/’) operator:   Operators 
 sphere, volume of:   Other Nonlinear Units 
 square roots:   Builtin Functions 
 star (‘*’) operator:   Operators 
 State Plane Coordinate System, US:   Unit Definitions 
 strict conversion:   Interactive Use 
 subtraction of units:   Sums and Differences of Units 
 sums and differences of units:   Sums and Differences of Units 
 sums of units:   Sums and Differences of Units 
 sums of units:   Unit Lists 
 survey foot, US:   Unit Definitions 
 survey measure, US:   Unit Definitions 
 survey mile, US:   Unit Definitions 
 syntax of units database:   Database Syntax 

T   
 temperature conversions:   Temperature Conversions 

U   
 Unicode support:   Unicode Support 
 unit completion using ‘?’ (readline only):   Readline Support 
 unit definitions:   Unit Definitions 
 unit expressions:   Unit Expressions 
 unit expressions, complicated:   Complicated Unit Expressions 
 unit list aliases, defining:   Defining Unit List Aliases 
 unit lists:   Unit Lists 
 unit name completion:   Readline Support 
 units data file, personal:   Units Data Files 
 units data files, additional:   Units Data Files 
 units definitions, adding:   Defining New Units 
 units definitions, changing:   Defining New Units 
 units functions:   Defining Nonlinear Units 
 units quotients:   Operators 
 units, definition of:   Defining New Units 
 units, lookup method:   Unit Definitions 
 units, piecewise linear:   Piecewise Linear Units 
 units, primitive:   Defining New Units 
 units, sums and differences:   Sums and Differences of Units 
 units, sums of:   Unit Lists 
 UNITSFILE environment variable:   Environment Vars 
 UNITSLOCALEMAP environment variable:   Environment Vars 
 UNITS_ENGLISH environment variable:   Environment Vars 
 US State Plane Coordinate System:   Unit Definitions 
 US survey foot:   Unit Definitions 
 US survey measure:   Unit Definitions 
 US survey mile:   Unit Definitions 
 UTF8:   Unicode Support 

V   
 verbose output:   Interactive Use 
 verbose output:   Interactive Use 
 vertical bar (‘’) operator:   Operators 
 volume measure, English customary:   Unit Definitions 

W   
 wire gauge:   Other Nonlinear Units 

Y   
 yard, international:   Unit Definitions 
