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Taken from apticron and modified.
This let's you find out the total packages that have available upgrades. Usefull if you want to check or show the total available upgrades on your system.
in Debian-based systems apt-get could be limited to the specified bandwidth in kilobytes using the apt configuration options(man 5 apt.conf, man apt-get). I'd quote man 5 apt.conf:
"The used bandwidth can be limited with Acquire::http::Dl-Limit which accepts integer values in kilobyte. The default value is 0 which deactivates the limit and tries uses as much as possible of the bandwidth..."
"HTTPS URIs. Cache-control, Timeout, AllowRedirect, Dl-Limit and proxy options are the same as for http..."
Please install aria2c before you try the above command. On ubuntu the command to install aria2c would be:
sudo aptitude install aria2