parser.php --file example_1.csv --unique-combinations=combination_count.csv
When the above is run in terminal it takes 3 parameter "example_1.csv" as filename and it'll be stored in files/output/file name. 4 parameter is actually 2 parameters. first one before equals tells program what to do(as per test only is requred unique-combinations), second one after equals sign is the name from where it gets all data, stored in files/input/file name