private EnvironmentVariableHandler getAppropriateHandler(String name) {
    if (name.startsWith(CliConstants.CONFIG_SHELL_PREFIX)) {
      return shellEnvHandler;
    } else {
      return executorEnvHandler;
    }
  }
retrieves the list of {@link CommandHandler}s setup in this environment
@return List of {@link CommandHandler}
samza-sql-shell/src/main/java/org/apache/samza/sql/client/cli/CliEnvironment.java