How to free up memory on Fedora Core 19

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Operating System: Linux – Fedora Core 19 (Schrödinger’s Cat)
Architecture: x86_64

As the OS up for long time, unused caches might hog the memory.
It is good to run some command to clear up.

# Note:
Free pagecache – echo 1 > /proc/sys/vm/drop_caches
Free dentries and inodes – echo 2 > /proc/sys/vm/drop_caches
Free pagecache, dentries and inodes – echo 3 > /proc/sys/vm/drop_caches

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