linux命令

shell 

(1)统计当前目录下子各个文件夹大小

du --max-depth=1 -h

ll：list all obejects in detail

lt: list all obejects in timing order

ln: link a source

cd -: alternate between recent two diretory

top: report cpu resource

df：report Disk usage

VI

YY: copy current line

P: paste last copied line

DD: delete current line

x: delete selected word

ctrl + A: num +1

ctrl + X: num -1

u: draw back last operation

Q +"word"+"key board operation"+Q: ask VI to remeber the operation between QQ, to make it true num times just type "digital num @ word"

ctrl +v: vertical editing mode "diagonally  select the rectangle area using cursor"

:1,$s/A/B/g: substitue all "A" by "B"

:1,.s/A/B/g: substitue "A" by "B" from  first line to curruent line

:g/A: display all lines contains A