EthernetStatus script and the LaunchCtl plist

.local/bin/ethernetstatus

@@ -0,0 +1,58 @@
+#!/bin/bash
+
+get_adapter_name() {
+    adapter=$(/usr/sbin/networksetup -listnetworkserviceorder | /usr/bin/sed -En 's|^\(Hardware Port: AX88179A, Device: (en.)\)$|\1|p')
+    echo "$adapter"
+}
+
+check_ethernet_status() {
+    adapter="$1"
+    status=$( /sbin/ifconfig "$adapter" | grep 'status: active' )
+    if [ -n "$status" ]; then
+        echo "Ethernet on adapter $adapter is connected"
+        return 0
+    else
+        echo "Ethernet on adapter $adapter is not connected"
+        return 1
+    fi
+}
+
+open_app() {
+    app="$1"
+    if ! pgrep -f "$app" >/dev/null; then
+        /usr/bin/open -a "$app"
+    fi
+}
+
+close_app() {
+    app="$1"
+    if pgrep -f "$app" >/dev/null; then
+        pkill -f "$app"
+    fi
+}
+
+main() {
+    if [ "$#" -ne 1 ]; then
+        echo "Usage: $0 <program_to_run>"
+        return 1
+    fi
+
+    adapter=$(get_adapter_name)
+    if [ -z "$adapter" ]; then
+        echo "Failed to get adapter name"
+        return 1
+    fi
+
+    app="$1"
+
+    if check_ethernet_status "$adapter"; then
+        open_app "$app"
+    else
+        close_app "$app"
+    fi
+
+    return 0
+}
+
+main "$@"
+

Library/LaunchAgents/ethernetstatus.plist

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>Label</key>
+    <string>net.francof.ethernetstatus</string>
+    <key>ProgramArguments</key>
+    <array>
+        <string>/Users/afonso/.local/bin/ethernetstatus</string>
+        <string>Ethernet Status</string>
+    </array>
+    <key>RunAtLoad</key>
+    <true/>
+    <key>WatchPaths</key>
+        <array>
+            <string>/Library/Preferences/SystemConfiguration</string>
+        </array>
+</dict>
+</plist>
+