parallel a script - new

[yacob sen]

Dear All,
I have a script 
for file in  *.a............do
prog -i $file -type s  
done
Here
 the executable program "prog" needs the file name as input after the "-i" 
option. I do not have also control  over the output files. the prog program 
outputs the result in the directory I run. 
Is it possible to use GNU parallel for this type of jobs.  I figured out that 
it is easy to pass the file name but find it it difficult to pass the date 
extracting from the filename the program.
Kind regardsYacob