rev

Reverse the text string "hello"

$ echo "hello" | rev

$ rev [file]

rev [option] [file...]

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.

This utility is a line-oriented tool and it uses in-memory allocated buffer for a whole wide-char line. If the input file is huge and without line breaks then allocating the memory for the file may be unsuccessful.

-h, --help

Display help text and exit.

-V, --version

Print version and exit.

For bug reports, use the issue tracker at <https://github.com/util-linux/util-linux/issues>.

The rev command is part of the util-linux package which can be downloaded from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.

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