[Bug-readline] tab completion

[LynnOS]

hi,all
I am new to use readline .i want to implement tab comletion on arguments
for example
> software + space + TAB
It can list software arguments {install,uninstall} and so on
Now i already impletment command in first level

is that right to use rl_completion_entry_function pointer?
how to get the first level value when i implement second leve tab
completion


Thanks all

Lynn

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OpenEmbedded,Linux vserver,Python