Scripting metasploit with msfcli

I found the tutorials on the web to not work out of the box as msfcli is very picky about the format of the arguments, this is the snippet I used to do some testing, a super-simple Bash script (instead of the `cat file4` you can put whatever funky ls magic you need to do to locate your file):

#!/bin/bash
for host in `cat file4`
do
        echo pwning host $host;
        msfcli "auxiliary/scanner/scada/modbusdetect" RHOST $host E;
done