ifconfig

When `ifconfig` is not installed on a Linux machine (i..e, `sudo apt install net-tools`), the following error is displayed.

```
	+ OUTPUT directory (your output is placed here)  :  0out/

	 [+] Using port : 5001
sh: 1: ifconfig: not found
	 [+] My IP is : 
```

Add a `try` case to check for this missing installation. Provide feedback to user about how to fix issue.