---
name: "unifuzz"
section: "1"
platform: "linux"
package: "uniutils"
version: "2.28-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/unifuzz"
---

# unifuzz(1)

Emit strings designed to test Unicode handling

## NAME

unifuzz - Emit strings designed to test Unicode handling

## SYNOPSIS

**unifuzz (\[option flags\])**

## DESCRIPTION

*unifuzz* emits strings designed to test the ability of programs intended to accept Unicode input to handle unexpected input. These include: characters from all Unicode ranges, Private Use characters, surrogates, undefined characters, non-characters, control characters, exotic space characters, sequences violating normalization rules, unexpected sequences (e.g. a base character from one range followed by a combining character from another range), and long sequences of combining characters. It can also generate very long lines, strings containing embedded nulls, and ill-formed UTF-8.\

## COMMAND LINE FLAGS

- \-b

  Restrict the output to the Basic Multilingual Plane (Plane 0).

- \-g

  Do not emit specific characters.

- \-h

  Print usage information.

- \-l

  Emit very long lines.

- \-n

  Emit string with embedded nulls.

- \-q

  Be quiet. Omit commentary.

- \-r \<number\>

  Set the number of random characters to emit.

- \-S

  Scan ranges - emit a character from each range.

- \-s \<seed\>

  Set the seed for the random number generator.

- \-u

  Emit ill-formed UTF-8.

- \-v

  Print version information.

The sequence of random characters is determined by a pseudorandom number generator, so the same sequence can be obtained by setting the seed to the same value. If not set on the command line, a seed is chosen based on the time of execution. The seed used is included in the output in a line of the form "Seed = NNNNNN" immediately preceding the random character sequence. Note that in order to obtain the same sequence it is necessary to keep the same setting for restriction of output to the BMP.

## REFERENCES

Unicode Standard, version 5.0

## AUTHOR

Bill Poser\
 billposer@alum.mit.edu

## LICENSE

GNU General Public License