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The Linux kernel uses unused memory in caches. When you execute "free" you never get the "real" available memory.
There are 2 alternatives - vote for the best!
where proc filesystem mounted under /proc
=1 --> to free pagecache
=2 --> to free dentries and inodes
=3 --> to free pagecache, dentries and inodes
If you can do better, submit your command here.
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