Add get-lan-ip script

get-lan-ip/README.md

@@ -0,0 +1,9 @@
+## Why?
+
+This is a handy script to get the server's primary IP address.
+
+## How to use?
+
+```bash
+bash -c "$(wget -qLO - https://raw.githubusercontent.com/bigbeartechworld/big-bear-scripts/master/get-lan-ip/run.sh)"
+```

get-lan-ip/run.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+# This script attempts to find the server's primary IP address.
+# It first tries using 'ifconfig' and then falls back to 'ip addr' if 'ifconfig' doesn't produce a result.
+
+# Identify the primary network interface by checking the default route.
+primary_interface=$(ip route | grep default | awk '{print $5}')
+
+# Try to retrieve the server's primary IP address using ifconfig.
+ifconfig_ip=$(ifconfig $primary_interface | grep -oE 'inet (10\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}|172\.(1[6-9]|2[0-9]|3[0-1])\.[0-9]{1,3}\.[0-9]{1,3}|192\.168\.[0-9]{1,3}\.[0-9]{1,3})' | awk '{print $2}')
+
+# Check if the result from ifconfig is empty.
+# If it is, try to use 'ip addr' to retrieve the IP.
+if [ -z "$ifconfig_ip" ]; then
+    # Try to retrieve the server's primary IP address using 'ip addr'.
+    ip_ip=$(ip addr show $primary_interface | grep -oE 'inet (10\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}|172\.(1[6-9]|2[0-9]|3[0-1])\.[0-9]{1,3}\.[0-9]{1,3}|192\.168\.[0-9]{1,3}\.[0-9]{1,3})' | awk '{print $2}')
+
+    # Check if the result from 'ip addr' is non-empty.
+    # If it is, print the IP. Otherwise, print an error message.
+    if [ -n "$ip_ip" ]; then
+        echo "Server IP (via ip): $ip_ip"
+    else
+        echo "Unable to determine server IP"
+    fi
+else
+    # If the result from 'ifconfig' was non-empty, print the IP.
+    echo "Server IP (via ifconfig): $ifconfig_ip"
+fi