Rev

rev is the same as cat, only rev shows characters in reverse. Imagine a file foo that contains: hello world will print: olleh dlrow to print lines in reverse you can use tac, to print both lines and characters in reverse, for example, use: tac foo | rev

Provided by
Most (all?) Linux distributions incorporate this from the [util-linux] project.

Related Commands
These all relate to the output or processing of entire files
 * cat -- concatenate files into a single result.
 * tac -- line-reversed cat
 * nl -- output with line numbers
 * od -- dump in octal and other character representations.
 * base32 -- Encode in printable characters.
 * base64 -- Encode in printable characters.