REV(1) User Commands REV(1)

rev - reverse lines characterwise

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

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

2022-05-11 util-linux 2.38.1