define
Statement
A define
statement is of the form
define $var := expr;
The expression expr is evaluated and the result is assigned to the variable $var. The variable may not be defined before this statement; it is defined by the statement and only exists until the statement sequence in which the assignment is situated has been processed fully.
You can assign the elements of a list value to multiple variables at once:
define <$var1, $var2, ... > := expr;
The first, second, ... element of expr, which must be a list, is assigned to the new variable $var1, $var2, ... respectively. The number of variables must match the length of the list value.