od - dump files in octal and other formats
od [OPTION]... [FILE]...Options you will use
-c- Show each byte as a printable character or an escape: \r \n \t. How you see a Windows line ending.
-A RADIX- How offsets are shown: d, o, x, n (none).
-t TYPE- Output format: x1 hex bytes, c characters.
Try od in a real terminal Free, in your browser - a real Ubuntu terminal to try it in, with missions that check your work.