The details of the rule syntax can be found in ICU's User Guide.

-h, -?, --help

Print help about usage and exit.

-V, --version

Print the version of genbrk 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.

-o, --out output-file

The output data file to write.

ICU_DATA

Specifies the directory containing ICU data. Defaults to /usr/share/icu/3.6/. Some tools in ICU depend on the presence of the trailing slash. It is thus important to make sure that it is present if ICU_DATA is set.