rev - Man Page

• Reverse text typed into terminal: rev
• Reverse the text string "hello": echo "hello" | rev
• Reverse an entire file and print to stdout: rev path/to/file
• Use '\0' as a line separator (zero termination): rev -0 path/to/file
• Display help: rev -h
• Display version: rev -V

tldr.sh

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.

-0,  --zero

Zero termination. Use the byte '\0' as line separator.

tac(1)

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.

tac(1).