Linux free命令用于显示内存状态，显示内存的使用情况，包括物理内存，交换内存，以及系统核心使用的缓冲区等，这些信息是通过解析文件 /proc/meminfo 而得到的。
语法格式：free [参数]
常用参数：
| -b | 以Byte显示内存使用情况 |
| -k | 以kb为单位显示内存使用情况 |
| -m | 以mb为单位显示内存使用情况 |
| -g | 以gb为单位显示内存使用情况 |
| -s | 持续显示内存 |
| -t | 显示内存使用总合 |
参考实例
显示内存使用情况：
[root@bunian ~]# freetotal used free shared buff/cache availableMem: 3880176 1836392 145816 16904 1897968 1783936Swap: 1049596 338524 711072[root@bunian ~]# free total used free shared buff/cache available Mem: 3880176 1836392 145816 16904 1897968 1783936 Swap: 1049596 338524 711072[root@bunian ~]# free total used free shared buff/cache available Mem: 3880176 1836392 145816 16904 1897968 1783936 Swap: 1049596 338524 711072
用MB显示内存使用情况：
[root@bunian ~]# free -mtotal used free shared buff/cache availableMem: 3789 1764 165 16 1859 1771Swap: 1024 330 694[root@bunian ~]# free -m total used free shared buff/cache available Mem: 3789 1764 165 16 1859 1771 Swap: 1024 330 694[root@bunian ~]# free -m total used free shared buff/cache available Mem: 3789 1764 165 16 1859 1771 Swap: 1024 330 694
用KB显示内存使用情况：
[root@bunian ~]# free -Ktotal used free shared buff/cache availableMem: 3880176 1796452 171472 16904 1912252 1823828Swap: 1049596 338524 711072[root@bunian ~]# free -K total used free shared buff/cache available Mem: 3880176 1796452 171472 16904 1912252 1823828 Swap: 1049596 338524 711072[root@bunian ~]# free -K total used free shared buff/cache available Mem: 3880176 1796452 171472 16904 1912252 1823828 Swap: 1049596 338524 711072
以总和的形式显示内存的使用信息：
[root@bunian ~]# free -ttotal used free shared buff/cache availableMem: 3880176 1784824 179252 16904 1916100 1835504Swap: 1049596 338524 711072Total: 4929772 2123348 890324[root@bunian ~]# free -t total used free shared buff/cache available Mem: 3880176 1784824 179252 16904 1916100 1835504 Swap: 1049596 338524 711072 Total: 4929772 2123348 890324[root@bunian ~]# free -t total used free shared buff/cache available Mem: 3880176 1784824 179252 16904 1916100 1835504 Swap: 1049596 338524 711072 Total: 4929772 2123348 890324
周期性查询内存使用情况：
[root@bunian ~]# free -s 15total used free shared buff/cache availableMem: 3880176 1869656 144816 16904 1865704 1750692Swap: 1049596 338524 711072total used free shared buff/cache availableMem: 3880176 1891672 170604 16904 1817900 1728700Swap: 1049596 338524 711072total used free shared buff/cache availableMem: 3880176 1882656 170620 16896 1826900 1737724Swap: 1049596 338524 711072[root@bunian ~]# free -s 15 total used free shared buff/cache available Mem: 3880176 1869656 144816 16904 1865704 1750692 Swap: 1049596 338524 711072 total used free shared buff/cache available Mem: 3880176 1891672 170604 16904 1817900 1728700 Swap: 1049596 338524 711072 total used free shared buff/cache available Mem: 3880176 1882656 170620 16896 1826900 1737724 Swap: 1049596 338524 711072[root@bunian ~]# free -s 15 total used free shared buff/cache available Mem: 3880176 1869656 144816 16904 1865704 1750692 Swap: 1049596 338524 711072 total used free shared buff/cache available Mem: 3880176 1891672 170604 16904 1817900 1728700 Swap: 1049596 338524 711072 total used free shared buff/cache available Mem: 3880176 1882656 170620 16896 1826900 1737724 Swap: 1049596 338524 711072
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