Overwrite a file

Dear all,

Good morning.

I have a file, temp
which has the content:
p(1,2,3).

I have run the following:
open(temp,update,File),
read(File,p(X,Y,Z)),
Q is X + Y + Z,
write(File,p(X,Y,Q)),
close(File).

My question is, is it possible to overwrite p(1,2,3) to p(1,2,6)?
I have tried the above, it only appends p(1,2,6) at to the file.

Thanks.





Regards,
Jordan Chong
EWI Department
Universiteit Twente