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NAME
rev - reverse lines of a file or files
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 specified, the standard input is read.
AVAILABILITY
The rev command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
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The coreutils 'tac' command outputs a file in reverse line order.
You don't need pipe to output literal string:
rev
eh, anti-xss paranoia broke my command.
rev [[[ "linux"
Replace [ with less than character