当前工作路径

pwd

## /Users/shihchosen/Documents/blog/shichangshun.cn/source/_posts

列出目录内容

ls 

## RClub
## Untitled.Rmd
## Untitled.html
## sketch.html
## sketch.md
## wordcloud.md
## 技术
## 学习笔记
## 债券发行与承销笔记.md

更改当前路径

cd /Users/shihchosen/Desktop
pwd

## /Users/shihchosen/Desktop

cd ~/Desktop
pwd
cd ./Cpp
pwd
cd ../..
pwd

## /Users/shihchosen/Desktop
## /Users/shihchosen/Desktop/Cpp
## /Users/shihchosen