Not to take anything away from this project, but you can filter on size, permission, etc easily and robustly using just `find` (try -perm, -size, -{c,m}time, etc flags): https://linux.die.net/man/1/find
If you are splitting strings (from output of `ls -l` presumably) for such tasks, then definitely take a look at find.
If you are splitting strings (from output of `ls -l` presumably) for such tasks, then definitely take a look at find.