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CentOS 7.0 - man page for rev (centos section 1)

REV(1)								   User Commands							    REV(1)

NAME
rev - reverse lines of a file or files
SYNOPSIS
rev [options] [file ...]
DESCRIPTION
The rev utility copies the specified files to standard output, reversing the order of characters in every line. If no files are specified, standard input is read.
OPTIONS
-V, --version Output version information and exit. -h, --help Output help and exit.
SEE ALSO
tac(1)
AVAILABILITY
The rev command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils/util- linux/>. util-linux September 2011 REV(1)