clean up memory of unnecessary things (Kernerl 2.6.16 or newer)

$ sync && echo 1 > /proc/sys/vm/drop_caches

run sync first to flush useful things out to disk!!!

To free pagecache:

echo 1 > /proc/sys/vm/drop_caches

To free dentries and inodes:

echo 2 > /proc/sys/vm/drop_caches

To free pagecache, dentries and inodes:

echo 3 > /proc/sys/vm/drop_caches

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by David Winterbottom (codeinthehole.com)

Tags: bash cmd Commands shell scripts