HistoryDecorator command = new HistoryDecorator(exec, readHistory(context));
context.addFrameworkListener(command);
context.addBundleListener(command);
m_history = command;
commands.put("history", new HistoryCommand(command).setContext(context).setHelp(
"history {<n>} - Show the last commands (up to <n> if present)."));
return command;
}