Why This Script?
While in its simplest form of usage, this script will only print out the public (& private) IP address along with the SSID to which the machine is connected to, the results therefrom can be used for a variety of other purposes – I will let your imagination fly you to your dream destination!
The Script
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | #! /bin/bash # BASH script to display the IP Address - one that the machine has, # as well as router's public IP Address, if any. # Tested on Apple Mac Snow Leopard 10.6.2 # First written : Gowtham, Thu Dec 31 12:05:35 EST 2005 # Last modified : Gowtham, Thu Dec 31 12:05:35 EST 2005 # en1 is the wireless interface. # Change appropriately, if different export WIFI_INTERFACE="en1" # Details about the ${WIFI_INTERFACE} ifconfig ${WIFI_INTERFACE} > public_ip.txt export STATUS=`cat public_ip.txt | grep "status" | awk '{print $4}'` # Analyze the details and display appropriate information if [ "$STATUS" = "active" ]; then export IPADDRESS=`cat public_ip.txt | grep broadcast | awk '{print $2}'` export SSID=`system_profiler SPAirPortDataType | \ grep -A1 "Current Network Information:" | \ tail -1 | awk -F ':' '{print $1}' | \ sed 's/^[ \t]*//;s/[ \t]*$//'` else echo echo " `date`" echo " You are not connected to the internet" echo exit 0 fi # Get the public IP address, $NSIP export NSIP=`curl -s http://checkip.dyndns.org | awk '{print $6}' | \ awk -F '<' '{print $1}'` # Compare $IPADDRESS & $NSIP # Display appropriate information along with SSID if [ "$IPADDRESS" = "$NSIP" ]; then echo echo " `date`" echo " SSID : $SSID" echo " IP Address : $IPADDRESS" echo else echo echo " `date`" echo " SSID : $SSID" echo " Machine's static IP Address : $IPADDRESS" echo " Router's public IP Address : $NSIP" echo fi # Delete the scratch file rm -f public_ip.txt |
Screenshots
Directly connected to the internet
Configured behind a router
I must thank Jon DeVree [@nuxi] for help with a previous version of this script [for linux] as well as Sarah for graciously letting me use her WiFi network.
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