how to monitoring internet traffic

[mierda tuti]

Hi,

I try to monitoring internet speed (donwload/upload speed) with some
aplication to can generate a text file to then I can use it for a script.

For instanace:

pepe.txt: download=72 kb/s
               upload=13 kb/s

Bun I don't know what aplicaction can I use or commnad and how do it?

Any help? Thanks a lot and sorry for my english
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