here, for linux

now，

here，to do what:

 

here to drop the knowledge I have learned, using my own tones.

 

focus on the foundamental knowledge as a linux or unix system user, or developer.

 

mainly to get a concolusion from learned,the simpler, the better.

 

 

here, not to do what:

 

don't list or copy any things from other sites; just post a link if necessary.