Tac

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

Provided by
Most (all?) Linux distributions incorporate this from the GNU Coreutils: and use its man page Many Linux systems, however, are using a different version. The current author has not yet tracked this down.

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