Linux显示所有输出域自动缩小到最短三数字单元和显示单元的打印

youhaidong@youhaidong-ThinkPad-Edge-E545:~$ free -h
             total       used       free     shared    buffers     cached
Mem:          3.0G       1.4G       1.6G       7.1M        62M       621M
-/+ buffers/cache:       715M       2.3G
Swap:         3.8G         0B       3.8G
youhaidong@youhaidong-ThinkPad-Edge-E545:~$ free --human
             total       used       free     shared    buffers     cached
Mem:          3.0G       1.5G       1.5G       7.4M        64M       630M
-/+ buffers/cache:       839M       2.1G
Swap:         3.8G         0B       3.8G