[CentOS] How to measure file transfer speed?

From: hadi motamedi <motamedi24 at gmail.com>
>I have one centos server equipped with WiFi . I want to measure data rate speed on this connection . Is there any utility on my centos that can measure data speed on one specific Ethernet connection when transferring large size files through WiFi connection?

As in (file_size / transfer_time)?
Many transfer applications dumps the transfer rate (wget, etc...).

JD