Category: General / Allgemein


Gold – cash – electrons – magnetic fields really? Is that how mankind pays its bills? At ever higher risks of things getting hacked or stolen. Imho this is not making life easier – it is making it more complicared […]

Who is THE Urban Penguin?

Andrew Mallett also on twitter apparently… 😀 pretty complete video series on LPIC1 FOR FREE ONLINE ON YOUTUBE 🙂 GOOD JOB MR MALLETT! 🙂 THANKS! LPIC2 not so much… you will have to pay for it 🙂 Andrew is an […]


nginx can be used as webserver, web-proxy and even mail-proxy. „Apache ist aufgrund seiner Architektur und Arbeitsweise doch eher der Traktor unter den Webservern.“ X-D (src) let me try to translate: „Apache is due to its architecture and functioning rather […]

webserver software marketshare – NetCraft – Web Internet stats statistics – growth number of sites – total number of websites – internet stats statistics

according to apache(2 i guess) is still the dominant webserver on the internet with a market share of 50%. src: according to it is „only“ 40% market share for the apache(2) webserver. also most sites are running […]


btrfs is used by SUSE12 for the /root partition – where it is doing daily snapshots of the installed OS. It has more functionality built-in than just storing files. This article wants to take btrfs for a test-drive. Video Tutorials: […]


teaching Artificial Intelligence Laboratory, Department of Informatics, University of Zurich Formal Methods for Computer Science II, Teaching Assistant, Fall Term 2013 Introduction to Artificial Intelligence: The ShanghAI Lectures, Teaching Assistant, Fall Term 2012 Institute of Embedded Systems, Zurich University of […]


to be honest… i find all of those meassurement tools too complicated to install. they probably all have their validity – but why not simply do it like this: given that you have a webserver installed and the web-root is […]

about – x11 display server – display or login manager – window manager

The X11 Window System Developer(s) X.Org Foundation  Initial release 6 April 2004; 13 years ago[1] Stable release 1.19.3 / 15 March 2017; 2 months ago[2] Repository, git://, git:// Written in C Operating system Cross-platform Size 3.7 MiB[3] Available in English Type Display […]

top10 most used mail servers – segfault exim4

a hacked e-mail account is a catastrophe – look at Hillary. telnet 25; # a simple telnet tells you that this server is running Trying… Connected to Escape character is ‚^]‘. 220 ESMTP Exim 4.XX_X Tue, […]


passwd -l maria; # disables account maria passwd: password expiry information changed. grep maria /etc/shadow maria:!$6$w9DaelrP$/tJiXC2PU0B.XOupP0sFTySis5VfkMwv0DnoFy3.d.nC8gXJU.DSbU0Uryyex40P67keCFoQuxEjZ8RD9kDGU0:17325:0:99999:7::: passwd -u maria; # enable account maria passwd: password expiry information changed. /etc/passwd grep /bin/bash /etc/passwd; # output all interactive user accounts that use […]

gpg cheat sheed – encrypting files with gpg

Warning! while gpg is very likely sound and solid encryption – what is far more likely to be compromised is YOUR HARDWARE – every network card – wifi card – usb UMTS G3 modem – PCI-Card – contains enough RAM […]

cool stuff you can do with ssh

i assume you have setup public-private-key-authentication and tested its workings. run local scripts remotely You can run local scripts remotely by executing bash on the remote system and feeding it your script ssh user@host ‚bash -s‘ < script.s sftp kick […]


looks different in every distro… Debian8 root@debian:~# uname -a; # tested on Linux debian 3.16.0-4-686-pae #1 SMP Debian 3.16.43-2 (2017-04-30) i686 GNU/Linux root@debian:~# ll /etc/X11/ total 72K drwxr-xr-x 2 root root 4.0K Jun 2 15:39 app-defaults -rw-r–r– 1 root root […]


Everything in Linux is presented as files and folders – even devices – even your printer. And that is also how almost everything is read-write-accessed – as files. /dev, /proc and /sys are „virtual (pseudo) filesystems“ (not existing on harddisk, […]


Yay! There are now 3500 Linux games on Steam i wonder if you can play all android(java) games on a PC as well?