Execute bash script on different hosts (ip list in file) via ssh

for host in $(cat /home/host_list | grep IP | egrep -v '^#' | awk '{print $3}' | sort);do

HostnameIP=$(echo "$host" | tr -d "[a-z]");
echo "##### $HostnameIP######";
sleep 4
ssh -i sshkey ec2-user@$host < bash_script

done