+Upgrade only packages from the grml-stable Debian repository:
+
+echo 'deb http://deb.grml.org/ grml-stable main' > /etc/apt/grml-stable.list
+apt-get -o Dir::Etc::sourcelist=/etc/apt/grml-stable.list -o Dir::Etc::sourceparts=/doesnotexist update
+apt-get upgrade
+--
+Install Centos into a directory:
+
+% febootstrap centos-5 directory http://mirror.centos.org/centos-5/5.3/os/i386/
+--
+Install Fedora into a directory:
+
+% febootstrap fedora-11 target_directory
+--
+Use Nessus / OpenVAS (remote network security auditor):
+
+Install software packages:
+# apt-get update
+# apt-get install openvas-client openvas-server openvas-plugins-base openvas-plugins-dfsg
+
+Add a user:
+# openvas-adduser
+
+Start openvas server (takes a while):
+# Start openvas-server
+
+Invoke client as user:
+% OpenVAS-Client
+--