Compiling SPECFUN and similar libraries

Hi,

I often find in libraries downloaded from Netlib that some lines start
with CS or CD, like this:

CS REAL
CD DOUBLE PRECISION

To compile a single/double precision version of the code, all
occurences of CS/CD in the first two columns must be changed to
blanks. How can I do this automatically? Most text editors can replace
a string with another, also specifying that the first string must be a
whole word (in this way I avoid eliminating occurences of CS/CD inside
bigger strings) but I'd prefer to explicitly specify that CS/CD must
occur in the first two columns of a line. Maybe I want to be a bit too
safe :-) but since I have seen this "trick" so often in many
libraries, I was wondering if there is some standard Unix utility
which is commonly used to do this.

Best Regards,

deltaquattro
.

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