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System properties given on the command line can be directly included as IzPack variables when using the SYSTEM_ prefix followed by the system property name in the variable name, and substituting alls occurences of '.' by '_'. No substitution happens in this case, if the according system variable cannot be found in the execution environment. This means that for example the string ${SYSTEM_java_version} gets inserted into the output as a literal string, instead of replacing it by an environment value.

Examples:

  • java.version would be available as $SYSTEM_java_version
  • os.name would be available as $SYSTEM_os_name

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