step 1. do scanning, this will scan dir and output its csv
ex. scanner.py -i dir1 -o dir1.csv; scanner.py -i dir2 -o dir2.csv;

step 2. do cleanning, this will remove duplicated files in dir2.  
ex. cleaner.py -b dir1.csv -e dir2.csv

step 1: do scanning, this will output base.csv and extr.csv
ex. scanner_base_extr.py -b dir1 -e dir2

step 2. do cleanning, this will remove duplicated files in dir2.  
ex. cleaner.py -b base.csv -e extr.csv

scanner.py -h

scanner_base_extr.py -h

cleaner.py -h