- [ ] file operations
  - [ ] write to file (at index)
  - [ ] read from file (at index)
  - [ ] print_file (maybe just calling cat???)
- [ ] a tape type - representing a file?
- [x] a record type - x1,x2,x3,x4,x5
  - [x] comparing records
- [ ] natural merge sort
- [ ] configuration
  - [ ] cmd args - man getopts
- [ ] file input
- [ ] keyboard input
- [ ] testing
- [ ] report