linux命令

 mkdir 
 
 vim   xx.js 
 
 ll
 
 ls
 
 rm
 
 mv
 
 esc i
 
 :w
 
 :q
 
 
 cp  a1.js  src/a1.js
 
 :wq
 
 pwd
 
 cat xx.js
 
 head xx.js -n 1
 
 tail xx.js -n 2
 
 grep '2' xx.js