AWK script for calculating link utilization

suhani chawla <[email protected]>
Newsgroups gmane.network.simulator.isi
Message-ID <CAEqKMJ5RALEc9sXBwomUzQiERPdiQ=7nBYaqxCd0MFtU-4rFVA@mail.gmail.com>
i need awk script for calculating link utilization of a bottleneck link.
Please provide me.
Atleast give me some  idea.
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