如何启用bash命令行开关的制表完成？

问题描述：

使用庆典，我可以完成与TAB的命令。通常情况下，它也应完成命令行开关：例如当我输入：

With bash, I can complete a command with TAB. Normally, it should also complete the command line switches: e.g. when I typed:

java -

就应该给我准备。它不是。我怎样才能让这个preVIEW？

it should show me the possibilities. It does not. How can I enable this preview?

答