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21 Database Command Syntax

unit definition

Define a regular unit.

prefix- definition

Define a prefix.

funcname(var) noerror units=[in-units,out-units] domain=[x1,x2] range=[y1,y2] definition(var) ; inverse(funcname)

Define a nonlinear unit or unit function. The four optional keywords noerror, ‘units=’, ‘range=’ and ‘domain=’ can appear in any order. The definition of the inverse is optional.

tabname[out-units] noerror pair-list

Define a piecewise linear unit. The pair list gives the points on the table listed in ascending order. The noerror keyword is optional.

!endlocale

End a block of definitions beginning with ‘!locale’

!endutf8

End a block of definitions begun with ‘!utf8’

!endvar

End a block of definitions begun with ‘!var’ or ‘!varnot’

!include file

Include the specified file.

!locale value

Load the following definitions only of the locale is set to value.

!message text

Display text when the database is read unless the quiet option (-q) is enabled. If you omit text, then units will display a blank line. Messages will also appear in the log file.

!prompt text

Prefix the ‘You have:’ prompt with the specified text. If you omit text, then any existing prefix is canceled.

!set variable value

Sets the environment variable, variable, to the specified value only if it is not already set.

!unitlist alias definition

Define a unit list alias.

!utf8

Load the following definitions only if units is running with UTF-8 enabled.

!var envar value-list

Load the block of definitions that follows only if the environment variable envar is set to one of the values listed in the space-separated value list. If envar is not set, units prints an error message and ignores the block of definitions.

!varnot envar value-list

Load the block of definitions that follows only if the environment variable envar is set to value that is not listed in the space-separated value list. If envar is not set, units prints an error message and ignores the block of definitions.