---
name: "gencfu"
section: "1"
platform: "linux"
package: "icu"
version: "78.3-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/gencfu"
---

# gencfu(1)

Generates Unicode Confusable data files

## NAME

**gencfu** - Generates Unicode Confusable data files

## SYNOPSIS

**gencfu** \[ **-h, -?, --help** \] \[ **-V, --version** \] \[ **-c, --copyright** \] \[ **-v, --verbose** \] \[ **-d, --destdir** *destination* \] \[ **-i, --icudatadir** *directory* \] **-r, --rules** *rule-file* **-w, --wsrules** *whole-script-rule-file* **-o, --out** *output-file*

## DESCRIPTION

**gencfu** reads confusable character definitions in the input file, which are plain text files containing confusable character definitions in the input format defined by Unicode UAX39 for the files *confusables.txt* and *confusablesWholeScript.txt.* This source (.txt) format is also accepted by ICU spoof detectors. The files must be encoded in utf-8 format, with or without a BOM. Normally the output data file has the **.cfu** extension.

## OPTIONS

- **-h, -?, --help**

  Print help about usage and exit.

- **-V, --version**

  Print the version of **gencfu** and exit.

- **-c, --copyright**

  Embeds the standard ICU copyright into the *output-file*.

- **-v, --verbose**

  Display extra informative messages during execution.

- **-d, --destdir** *destination*

  Set the destination directory of the *output-file* to *destination*.

- **-i, --icudatadir** *directory*

  Look for any necessary ICU data files in *directory*. For example, the file **pnames.icu** must be located when ICU's data is not built as a shared library. The default ICU data directory is specified by the environment variable **ICU\_DATA**. Most configurations of ICU do not require this argument.

- **-r, --rules** *rule-file*

  The source file to read.

- **-w, --wsrules** *whole-script-rule-file*

  The whole script source file to read.

- **-o, --out** *output-file*

  The output data file to write.

## VERSION

1\.0

## COPYRIGHT

Copyright (C) 2009 International Business Machines Corporation and others