RENAME_EXIT_NOTHING: 4
`rename_exit_codes.1' -> `rename_exit_values.1'
`rename_exit_codes.2' -> `rename_exit_values.2'
EXIT_SUCCESS: 0
rename: rename_exit_values.2: rename to rename_exit_codes.2 failed: Is a directory
`rename_exit_values.1' -> `rename_exit_codes.1'
RENAME_EXIT_SOMEOK: 2