rev1
Reverse lines of a file
Usage
rev [file ...]
Overview
The rev utility copies the specified files to the standard output, reversing the order of characters in every line. If no files are specified, the standard input is read.
Examples
Reverse the text from stdin:
$ echo -e "reverse \t these\ntwo lines" | rev eseht esrever senil owt
Releases
163 releases since Mac OS X 10.0; the text changed 2 times.