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FreeBSD 11.0 - man page for rev (freebsd section 1)

REV(1)							    BSD General Commands Manual 						    REV(1)

NAME
rev -- reverse lines of a file
SYNOPSIS
rev [file ...]
DESCRIPTION
The rev utility copies the specified files to the standard output, reversing the order of characters in every line. If no files are speci- fied, the standard input is read.
BSD
June 9, 1993 BSD