Linux以KB显示内存大小
youhaidong@youhaidong-ThinkPad-Edge-E545:~$ free -k
total used free shared buffers cached
Mem: 3103064 1739452 1363612 8244 67772 700036
-/+ buffers/cache: 971644 2131420
Swap: 3998716 0 3998716
youhaidong@youhaidong-ThinkPad-Edge-E545:~$ free --kilo
total used free shared buffers cached
Mem: 3103064 1737864 1365200 8244 67772 700036
-/+ buffers/cache: 970056 2133008
Swap: 3998716 0 3998716