BSD 2.11 - man page for rev (bsd section 1)

REV(1)											   REV(1)

NAME
       rev - reverse lines of a file

SYNOPSIS
       rev [ file ] ...

DESCRIPTION
       Rev  copies  the  named files to the standard output, reversing the order of characters in
       every line.  If no file is specified, the standard input is copied.

7th Edition				  April 29, 1985				   REV(1)