run script on multiple files

I have written a short perl script that munges climate data and then loads it into a postgres database. It works fine on one file at a time... syntax is ./program.pl filename

I would like to run it in a directory with multiple files. I have tried syntax ./program.pl file1 file2, but only the first file gets processed. Can anyone help me figure out how to run this script on a directory full of files that all need to be processed?

Thanks
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