[o]

[..]
  1. old_color_comparator
  2. old_cpio_header
  3. oldgnu_header
  4. opcode_names
  5. open_error_pipe
  6. open_include_file
  7. open_socket_in
  8. open_socket_out
  9. open_temp
  10. opendir
  11. opendir_info
  12. operate_one_file
  13. operate_single_file
  14. order
  15. other_panel
  16. out_ascii
  17. out_data
  18. output_format_t
  19. overwrite_query_dialog
[..]