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What command can I use in windows 7 that will tell me how much bandwidth one of my LAN adapters has?

It needs to be able to send its output to a text file.

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Are you looking for the negotiated port speed, such as 100Mb/s? or the current usage? or the remaining estimate based off of current usage? – MaQleod Apr 4 '12 at 21:05

Task Manager have them both: current network usage and the port speed for all adapters. You can send screenshot of the task manager window.

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