You do not know your ip address
You can use the ifconfig command to get your ip address. When you run it as user, do not forget to give it the full path.
/sbin/ifconfig -> this will print a lot of information
To just get your ip address out of this bunch of information you can use the following line of code:
env LC_ALL=C /sbin/ifconfig eth0|sed -n '/addr:/s/ [^r]*..//gp'
Just try it, it works. (tested on debian)
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.