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Linux常用命令-59：free
source link: https://xugaoxiang.com/2022/06/16/linux-cmds-59-free/
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free 命令显示系统中物理上空闲和已用的内存，包括交换内存。这些信息是通过解析文件 /proc/meminfo 而来的。
语法格式：free [参数]
常用参数：
free
# 以MB显示内存使用情况
free -mRecommend
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