rev

reverse lines characterwise

TLDR

Reverse the text string "hello"

$ echo "hello" | rev
copy


Reverse an entire file and print to stdout
$ rev [file]
copy

SYNOPSIS

rev [option] [file...]

DESCRIPTION

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.

OPTIONS

-h, --help

Display help text and exit.

-V, --version

Print version and exit.

REPORTING BUGS

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

AVAILABILITY

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/>.

SEE ALSO

tac(1)

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