[root@localhost ~]# free
total used free shared buffers cached
Mem: 1010860 354592 656268 6824 692 192560
-/+ buffers/cache: 161340 849520
Swap: 2097148 0 2097148
[root@localhost ~]#
[root@localhost ~]# free -m
total used free shared buffers cached
Mem: 987 347 639 6 0 188
-/+ buffers/cache: 158 828
Swap: 2047 0 2047
[root@localhost ~]#
[root@localhost ~]# free -h
total used free shared buffers cached
Mem: 987M 347M 639M 6.7M 692K 188M
-/+ buffers/cache: 158M 828M
Swap: 2.0G 0B 2.0G
[root@localhost ~]#