- Reverse the text string "hello":
echo "hello" | rev
- Reverse an entire file and print to
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.
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.