Linux以字节显示内存大小

youhaidong@youhaidong-ThinkPad-Edge-E545:~$ free -b
             total       used       free     shared    buffers     cached
Mem:    3177537536 1761021952 1416515584    8433664   69103616  715993088
-/+ buffers/cache:  975925248 2201612288
Swap:   4094685184          0 4094685184
youhaidong@youhaidong-ThinkPad-Edge-E545:~$ free --bytes
             total       used       free     shared    buffers     cached
Mem:    3177537536 1760796672 1416740864    8433664   69111808  715997184
-/+ buffers/cache:  975687680 2201849856
Swap:   4094685184          0 4094685184