Surprise! the shell suggests command line switches

Question

I noticed that the bash shell can suggest command line switches for your command.

Just type your command, a dash (-) and type tab. The shell will show you available switches.

For example, try:

andy@andyx:~$ java -

and press tab - Surprise!

The question is:

How do I interface with this feature. Ie, if I write a program that is to be run from the console, what's the API to tell the shell what switches are available?

Answer 1

您已经发现了Bash的可编程完成功能。

Answer 2

See:

$ man bash

In particular, the section entitled "READLINE" and subsection "Programmable Completion"

Answer 3

仅供参考：在Ubuntu和/或Debian中，脚本位于/etc/bash_completion.d/