private List<Integer> splitExecutionIds(String parameters) {
    List<Integer> execIds = new ArrayList<>();
    String[] params = parameters.split("\u0020");
    for (String param : params) {
      Integer id = null;
      try {
        id = Integer.valueOf(param);
      } catch (NumberFormatException e) {
      }
      if (id == null || !executions.containsKey(id)) {
        writer.print("Error: ");
        writer.print(param);
        writer.println(" is not a valid id.");
      } else {
        execIds.add(id);
      }
    }
    return execIds;
  }
Handles the given command
@param command input {@link CliCommand} to handle
@return false if command is to quit, or fatal error happened that Shell should not continue running. True o.w.
@throws CommandHandlerException if unrecoverable error happened while handling the input {@link CliCommand}
samza-sql-shell/src/main/java/org/apache/samza/sql/client/impl/CliCommandHandler.java