In terms of future development for the project I would like to extend the statements to include multiple AND and OR statements. While currently the program can take one such statement, allowing for restrictions on two values, there are many cases where restricting across multiple values would be extremely beneficial.
I think it would be very useful to include the LIKE operator, and given Perl's excellent regular expression capabilities it is likely it wouldn't be very difficult to implement.
I would also like to include a JOIN in the program so as to be able to manipulate multiple files at a time as opposed to being restricted to just the one.