两份linux教程

https://docs.google.com/document/d/1FgMqlHYDva5--sJuR1fc-wbidpvHMFKEvK4RHqD4px0/edit#heading=h.ffd1g4kxlpti

https://docs.google.com/document/d/1xOllgXRN10fWz1TsURh0OYI60TAVz0snD8HOzga5CCA/edit#