Monitor Bandwidth Usage with vnStat

[ Thanks to Dmitri Popov for this link. ]

"This means that once installed and configured, vnStat quietly monitors a specified network interface and saves the collected data. You can then use vnStat's command parameters to view detailed reports of your bandwidth usage.

"vnStat is available in the software repositories of many mainstream Linux distributions, so you can easily install it using your distro's package manager. On an Ubuntu-based system, vnStat can be installed using the sudo apt-get install vnstat command. Before you can start using the utility, you must specify the network interface you want vnStat to monitor. First, run the ifconfig command to view a list of all available network interfaces. You can then use the -u and -i parameters to create a database for the specified network interface, for example:"

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