free
顯示系統記憶體使用狀況
free是從 /proc/meminfo讀取資料
free
free -b //單位Bytes
free -m //單位MB
free -g //單位GB
free -t //實體記憶體加上swap
total
used
fee
shared
buffers：(buffer cache)relatively temporary storage for raw disk blocks.
cached：(page cache)in memory cache for files read from disk, doesn't include swapcache
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