Copy a randomly selected file from within the current user's home directory (up to two levels deep) to the /tmp directory, and give it a random 16-character alphanumeric name.
cp $(find ~/* -maxdepth 2 -type f | sort -R | head -1) /tmp/$(cat /dev/random | env LC_CTYPE=C tr -dc 'a-zA-Z0-9' | head -c 16)