rev - Man Page

reverse lines characterwise

Examples (TL;DR)


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, ā€‰--help

Display help text and exit.

-V, ā€‰--version

Print version and exit.

See Also


Reporting Bugs

For bug reports, use the issue tracker at


The rev command is part of the util-linux package which can be downloaded from Linux Kernel Archive.

Referenced By


2022-05-11 util-linux 2.38.1