free - Display amount of free and used memory in the system
$ free
total used free shared buffers cached
Mem: 2053440 522028 1531412 0 87076 265952
-/+ buffers/cache: 169000 1884440
Swap: 2441840 0 2441840
5秒监控一次
neo@neo-OptiPlex-780:~/workspace/Document$ free -s 5
total used free shared buffers cached
Mem: 2054224 1708876 345348 0 58908 696404
-/+ buffers/cache: 953564 1100660
Swap: 2077692 81948 1995744
total used free shared buffers cached
Mem: 2054224 1708876 345348 0 58908 696404
-/+ buffers/cache: 953564 1100660
Swap: 2077692 81948 1995744
total used free shared buffers cached
Mem: 2054224 1709000 345224 0 58908 696404
-/+ buffers/cache: 953688 1100536
Swap: 2077692 81948 1995744
原文出处：Netkiller 系列 手札
本文作者：陈景峯
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