Shell script to get Public IP from Router with cURL

A few days ago I explained how to get public IP address of your Router. I showed a shell script that uses a utility called, "wget". "wget" is very convenient for casual use but there is another utility called, "cURL".

It seems that cURL follows MIT/X license and wget uses GPL. A big difference for me is that there is a C language library version of cURL called libcurl but wget doesn't have anything like that. Although I am a big fan of GPL, GPL is a kind of restrictive than MIT license. Also cURL seems to have support more network protocols. In many ways, cURL is more attractive.

Thus I decided to make another script with cURL, which is not too different from the wget version.

pi@desktoppi ~ $ sudo apt-get install curl
Reading package lists... Done
Building dependency tree       
Reading state information... Done
curl is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 64 not upgraded.
pi@desktoppi ~ $

Make sure you have curl installed with a command: sudo apt-get install curl

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#!/bin/sh ID=admin PW=your_password URL=http://192.168.0.1/RgSetup.asp Filter="IP Address" CURL=/usr/bin/curl OPTION=-s GREP=/bin/grep TR=/usr/bin/tr if [ ! -f $CURL ]; then echo $CURL not found exit 1 fi if [ ! -f $GREP ]; then echo $GREP not found exit 2 fi if [ ! -f $TR ]; then echo $TR not found exit 3 fi $CURL $OPTION --user $ID:$PW $URL | $GREP "$FILTER" | $TR -d '</>a-zA-Z '

Create a script file; I named it public_ip_curl.sh. Don't forget to use your own ID and Password.
Note that the script now uses curl instead of wget.

pi@desktoppi ~ $ ./public_ip_curl.sh
68.6.230.226
pi@desktoppi ~ $ 

You can get the same result.
*PS: make sure you gave executable permission with a command: chmod a+x public_ip_curl.sh