Purpose

Parse the input expression using the Unix "bc" operation and
print the resulting value on the standard output

Usage

math arg1 op arg2

Arguments

arg1 = real value
op = operator ( +,-,*,/)
arg2 = real value

Output

Resultant value of the expression

Restrictions

Expressions using the special characters "*" or "()" must be
enclosed within double quotes

Example

math 2 + 3 addition
math "2 * 3" multiplication (note the quotes when "*" is used)
math 2 \* 3 another way of doing multiplication without quotes.
math 2 x 3 is also multiplication (no quotes needed)
math 4 - 5 subtraction
math 4 / 5 division.

For use within scripts, with passed arguments

mxy `math $x x $offset` `math $y x $offset`

(Note that the variable substitution for $x happens before the "x"
representing multiplication gets translated into "*".)