惊喜！ shell提示命令行开关 [英] Surprise! the shell suggests command line switches

问题描述

我注意到bash shell可以为您的命令建议命令行开关。

只需键入命令，破折号（ - ）和类型选项卡即可。

 <$ c $ 
 c> andy @ andyx：〜$ java  -  
  

b
$ b

问题是：

如何与此功能介面。也就是说，如果我写了一个程序，要从控制台运行，什么是API告诉shell什么开关可用？

解决方案

您发现了Bash的可编程完成功能。

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. I.e., 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?

解决方案

You have discovered Bash's programmable completion feature.

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