Dear all, i am wondering that How to get bandwidth usage in linux(coding relation)? so would you able to tell me the solutions? thanks.

bandwidth usage that mean how many percent of bandwidth that is already used.

Here is a link to some free opensource network bandwidth monitoring utilities: http://www.ubuntugeek.com/bandwidth-monitoring-tools-for-linux.html If you want to code your own utility, you can read through the source code of these utilities and find out how they work.