oSafin1的专栏

stage 1 i    [insert] x   [delete] p   [put] dd [delete line]     k h      l      j :w [write] :q  [quit] :x  [:wq]

In vmware virtual machine such as ubuntu, there is a 40G disk, which has 20G data and 20G empty space,      so, vmware will use 20G real disk space.     If you delete 10G data, vmware will also use