Well, I have spent a lot time on OSS, mainly using them instead of contributing to them. Now I feel it will be good to write something down. Something about OSS, something will be helpful to others. And of course, writing these down will help myself from relearning them in the future:) I found myself in this kind of situations for a few times and felt very painful about it.
PS, I am not a native English speeker. Please don't mind if I make some stipud mistakes.
Here it goes....
