all_server_list=(10.200.163.87 10.200.163.86 10.200.163.85 10.200.163.84 10.200.163.83 10.200.163.82 10.200.163.81)

for server in "${all_server_list[@]}";do
   echo "server is ${server}"
   ssh root@"${server}" "shutdown -h now"

   echo ""
done