通过free命令显示内存使用的情况

[root@sre01 ~]# free
              total        used        free      shared  buff/cache   available
Mem:         995748      175960      446008        7856      373780      663344
Swap:       2097148           0     2097148

[root@sre01 ~]# free -h
              total        used        free      shared  buff/cache   available
Mem:           972M        171M        435M        7.7M        365M        647M
Swap:          2.0G          0B        2.0G