Base64 is a command that turns data into text or reverses that process, following the recommendations of RFC 3548. This is used primarily for safely transmitting data in email communications.
These all relate to the output or processing of entire files
- cat -- concatenate files into a single result.
- tac -- line-reversed cat
- rev -- character-reversed cat
- nl -- output with line numbers
- od -- dump in octal and other character representations.