Well.. post are more welcome when they contain some Perl effort from part. If you show us what you tried monks can adjust their help based on your skill. Infact probably will be not so useful for you if i had answered something like: perl -le "system qq(prog $_) for glob $ARGV[0]" *.csv no?

If you want to create a perl program to process many files be sure to use strict and use warnings at the top of the program.

After you can profit of the glob function to build up a list of all .csv files. Then you can build up a foreach loop to process them.

L*