Is there any command that by using I can clean the cache in RHEL?
I used this command:
sync; echo 3 > /proc/sys/vm/drop_caches
but it didn't work.
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Depending on what you want to do you can use 1,2 or 3
Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free.
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
As this is a non-destructive operation and dirty objects are not freeable, the user should run 'sync' first.