Linux以GB顯示內存大小

youhaidong@youhaidong-ThinkPad-Edge-E545:~$ free -g
 total used free shared buffers cached
Mem: 2 1 1 0 0 0
-/+ buffers/cache: 0 2
Swap: 3 0 3
youhaidong@youhaidong-ThinkPad-Edge-E545:~$ free giga
 total used free shared buffers cached




Mem: 2 1 1 0 0 0
-/+ buffers/cache: 0 2
Swap: 3 0 3