This is my first time working with Perl. It's been, uh.... interesting. Relevant xkcd: https://xkcd.com/224/ To use the csv_sorter.pl program, simply add a .csv filename as a command line argument, like so: ~ User$ perl csv_sorter.pl input.csv Notes: *I am aware that it's best practice to use 3 arguments with open(). Maybe after sleep. Something something, MIT License. All rights reversed.;) Thanks for visiting!