How to use wget to test bandwidth / download speed ? try below wget command to download a 10MB or 100MB file from cachefly.

wget http://cachefly.cachefly.net/10mb.test
--2013-06-11 13:55:00--  http://cachefly.cachefly.net/10mb.test
Resolving cachefly.cachefly.net... 205.234.175.175
Connecting to cachefly.cachefly.net|205.234.175.175|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 10485760 (10M) [application/octet-stream]
Saving to: `10mb.test'

100%[===================================================================================================================>] 10,485,760  9.13M/s   in 1.1s    

2013-06-11 13:55:02 (9.13 MB/s) - `10mb.test' saved [10485760/10485760]

9.13 MB/s means 9.13x8=73Mbps/s, means your server's bandwidth is at least 73Mbps

Other bandwidth speed test downloads:

Download 100MB file from cachefly:  wget http://cachefly.cachefly.net/100mb.test

Download 100MB file from Seattle:   wget http://speedtest.sea01.softlayer.com/downloads/test100.zip

Download 100MB file from Dallas  :  wget http://speedtest.dal01.softlayer.com/downloads/test100.zip

Download 100MB file from San Jose:  wget http://50.23.64.58/downloads/test100.zip