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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.
Trickle is here: http://monkey.org/~marius/pages/?page=trickle
Trickle is a simple bandwidth limiter
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