Use findstr to find input from file a within file b, and send the output to a different file - scripting

Question

I'm trying to write a batch script in Windows to take a list of IP addresses and ping them. Once a site doesn't respond, I want Windows to take all of the unresponsive IP addresses, and parse them through a comparison file that has the IP and physical street addresses of these systems. Once the unresponsive sites are parsed through the comparison file, I want the end result to be the matching info from the compare file for only the sites that are unresponsive. I already have script written for Linux that does this same thing, but I wanted a Windows version for some of the customers I work with who aren't Linux savvy.
Here is my script:
#Echo Off
Set "ServerList=C:\Users\<mylogin>\ip.txt"
Set "LogFile=C:\Users\<mylogin>\PingResults.txt"
If Not Exist "%ServerList%" Exit /B
>"%LogFile%" (For /F UseBackQ %%A In ("%ServerList%"
) Do Ping -n 1 %%A|Find "TTL=">Nul&&(Echo Yes [%%A] > Nul)||Echo No [%%A])
findstr /f:%LogFile sites.txt > Down.txt
The script itself seems to execute just fine, but it doesn't put anything in the final output file of Down.txt, I'm positive I have something wrong in my findstr command.
Below is my Linux script that does this exact same thing. Yeah it's clunky but it gets the job done:
#!/bin/bash
# Script to test ssh connectivity using expect script
rm -f results.txt
clear
echo "Please be patient while the script runs..."
while read user ip port pass; do
${PWD}/test_ssh_edge_device.sh $user $ip $port $pass >> results.txt
done < rekor_edge_device_list.txt
#This will boil down the results of the ping script so only the IP address is left
cat results.txt | grep -B1 time > refined.txt
cat refined.txt | grep -Eo "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b" > refinedip.txt
#This will take the boiled down IP addresses and check them against the compare file, final output will be all system info for only downed systems
list=refinedip.txt
rm -f iplist.txt
exec 3<&0
exec 0<$list
while read line
do
cat compare.txt | grep $line >> iplist.txt
done
exec 0<&3
cat iplist.txt