Option files consist of several lines. Each line contains the setting for one option. An option setting has the form:
option=value
value may be either a string or an integer,
depending on the option's requirements. If the option accepts an
integer value a base may be specified using notation of the form
b%v, where b is
the base expressed in base 10 and v is the actual
value expressed in base b.
Comments are allowed. Any line that begins with an exclamation point is considered to be a comment and is ignored. Blank lines are also ignored in any option file.