networkchange.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" \
  "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>networkchange</string>
  <key>LowPriorityIO</key>
  <true/>
  <key>ProgramArguments</key>
  <array>
    <string>/Users/Shared/bin/networkchange.sh</string>
  </array>
  <key>WatchPaths</key>
  <array>
    <string>/private/var/run/resolv.conf</string>
  </array>
  <key>RunAtLoad</key>
  <true/>
</dict>
</plist>

checkSCU.sh

#!/bin/bash

url="https://login.scu.edu"

response=$(curl -sL --head --connect-timeout 3 "$url")

if [[ $? -ne 0 ]]; then
    open "/Users/Shared/bin/ReinstallOnGuardv1.app"
fi