The issue is when you need to echo something as root/sudo, that it doesn't work.  You can never do a sudo echo to an output file as you'd expect.

Take an example to clear out wasted RAM buffers/cache like this:

sudo echo 1 > /proc/sys/vm/drop_caches
-bash: /proc/sys/vm/drop_caches: Permission denied

The solution is to run tee as sudo/root

What we do is echo 1, but then pipe it to the "tee" command as sudo, which then writes the value to the proc entry drop_caches.

echo 1|sudo tee /proc/sys/vm/drop_caches
 

This will of course work whenever you need to echo something that requires root privileges.

Another example of using echo with tee.

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