php man page for rev

REV(1)								   User Commands							    REV(1)

NAME
       rev - reverse lines characterwise

SYNOPSIS
       rev [option] [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
	      Display version information and exit.

       -h, --help
	      Display help text and exit.

SEE ALSO
       tac(1)

AVAILABILITY
       The rev command is part of the util-linux package and is available from Linux Kernel Archive  <https://www.kernel.org/pub/linux/utils/util-
       linux/>.

util-linux							  September 2011							    REV(1)