下面的命令都要先按esc退出编辑模式
save file
:w save but not quit
:wq save and quit
:q! not save and quit
cut and paste
dd cut the line
ndd cut the current line and the following n-1 lines
p paste 注意粘贴的时候是从当前行的下一行开始粘贴
fold and unfold
zc fold
zo unfold