Zen of Linux

A really simple command to transcode a video file from one format/ container to another can be achived with
ffmpeg -i inspectorgadget.ogg inspectorgadget.avi
This illustrates the basic command-scheme ffmpeg uses. In this case ffmpeg transcodes an .ogg file to an .avi file (actually it just changes the container format). No further processing is done.

Managing installed software (so called packets) is pretty straightforward on linux systems like Debian.
Go to the console and edit the /etc/apt/sources.list Sometimes the location is a bit different, like /etc/sources.list
You can install software automatically from repositories, accessible via the internet. Adding a line like
deb ftp://ftp.de.debian.org/debian/ unstable main
to sources.list adds such a repository.
you can install […]

If you would like to ban a subnet, an IP address or a single country, most of these tasks can be done by using mod_rewrite and your .htaccess file.
Start by writing Rewrite conditions that match against the REMOTE ADDR variable. Depending on the length of your regexp you can ban a complete network, a subnet […]