I downloaded contrib/unbound_cache.sh from the latest link,
Edited CONF to /etc/unbound/and BASE to /usr in unbound_cache.sh
copied to /etc/unbound/
but when I run unbound_cache.sh from /etc/unbound/
$ sudo ./unbound_cache.sh -s /etc/unbound/unbound_cache.dmp
sudo: unable to execute ./unbound_cache.sh: No such file or directory