Category: GNU-Linux

Linux is pretty hardware independent, so most of the time you can just 1:1 clone/move harddisk to new machine and in 99% of cases it will just boot. make sure – target (new) machine’s harddisk is same or bigger size […]

preparations on terminal: detect your hardware: you can get old but well supported notebooks/laptops here like the dell latitude e4310 with this intel-spy-on-me wifi/bluetooth module on board: lshw |grep lue description: Bluetooth wireless interface product: DW375 Bluetooth Module capabilities: bluetooth […]

basically the advanced version of PiHole. WARNING! THIS IS not a complete OPNSense / PFSense tutorial it is rather just to get started. right now, one is (still) using iptables without any gui. there seems to be a lot of […]

warning: this only works if you have a gui/gnome installed. thanks goes to this superb tutorial with screenshots: http://xmodulo.com/debug-program-nemiver-debugger.html For Debian based distributions, it should be pretty straightforward: apt-get install nemiver; # Debian and Ubuntu pacman -S nemiver; # For […]

You might want to checkout very basic sequential write/read benchmark with dd. You might also want to checkout: cross os harddisk benchmark iozone and java. ============ OS and Kernel Linux server4.localdomain 4.15.7 #1 SMP Sun Mar 4 16:43:40 CET 2018 […]

maybe you want to run your own version of the kernel and you will have to prevent during an automatic update that this kernel will get “replaced”. same goes with firefox, thunderbird and LibreOffice yum and apt might not install […]

https://ytpak.net/watch?v=TBXf0f8uQvI “If we want a better America we will have to build it ourselves” (Snowden, 2016) “it is not possible to get a fair trial in the USA under Espionage act from 1917” Snowden is NOT against surveillance: “If its […]

What devices lurk in the user’s network? What computers are online what offline? quick arp scan with netdiscover (manpage: netdiscover.man.txt scanning with nmap What services/ports in what versions are online/open? over poorly or not so poorly documented LANs the user-admin […]

Brother 9460 CDN is a reliable old Brother LAN enabled Multifunction (MFC, Print, Scan, Fax) device. tested on/with: dell laptop E4310 + debian linux 32bit + brother 9460 cdn connected via LAN root@DebianLaptop:~# hostnamectl Static hostname: DebianLaptop Icon name: computer-laptop […]

the hardware: a webcam that is supported out of the box with most linux distros is the Logitech HD Pro Webcam C920 it has also HD resolution and stereo microphone. worth the investment if you do a lot of online […]

somtimes it is easier to land on the moon… than install a printer… [root@centos user]# hostnamectl Static hostname: centos.template Icon name: computer-desktop Chassis: desktop Operating System: CentOS Linux 7 (Core) CPE OS Name: cpe:/o:centos:centos:7 Kernel: Linux 4.15.1 Architecture: x86-64 Epson_Stylus_SX510W […]

https://www.teezily.com/rechenknecht3 shipping international Germany / France / USA / Spain for 5€ ! nice ! (Except Russia, Ukraine is 10€) or reuse this gimp created fsf_gnu_linux_logo_compilation.png with transparent background to do your own 100% OpenSource powered T-Shirt:

every year… this is such a good cartoon X-D thank you! thanks everyone involved for every line of open source written and tested and released often and early 🙂 wish you and your families a merry merry merry good time […]

firewall & pinguin: iptables where do thou go? it is said that when using “ip-sets” iptables and nftables achieve almost same performance (amounts of ips possible to block, without server becoming slow/unresponsive) Redhat and nftables on DDoS “so the only […]

one partly cloudy day i was trying to copy things via usb stick… it would not work. i realized: i haven’t used NTFS for a while 😀 yum install ntfs-3g fuse replug the stick. you don’t even have to restart […]

who is who? concepts: docker is written in Google Go by Docker Inc, SanFrancisco because it does not emulate any hardware – it is a linux container / sandbox or jail like Free BSD Jail or Solaris Zones or OpenVZ so […]

Debian Ubuntu Mint: for the deb based distributions hostnamectrl; # tested on Armbian (Debian for ARM Bullseye) su – root; # become root apt update; # always good apt install console-data # select a new keymap # for languages others […]

bc is cool, but it can not access shell variables directly, but you can pass them with <<< also there is no “pi” constant in bc that you could use in interactive mode. let one assume you would like to […]

if you download software, you should verify that what you downloaded is not a altered file of a hacked server distributing trojan horses and keyloggers (malware). it seems for the gpg verification it is a 3 step process. 1. download […]

update: safety first! when it comes to important files: safety comes first thus recommend to the user that wants to go pro the following backup system: have two complete backups at two different places: backupA: at the company, USB 3.0 […]

on intel / amd cpus/boards: use lm sensors: su – root; # become root apt-get install lm-sensors; # install sensors-detect; # detect available temperature sensors, answer with YES usually # monitor cpu temp every second while true; do sensors|grep Core; […]

You might want to checkout very basic sequential write/read benchmark with dd. You might want to checkout iozone in c harddisk benchmark. this benchmark is especially useful if you need to measure how java is performing on your harddisk/filesystem/os (linux […]

Update: as of 2019-01 and CentOS 7.6 the below setup may fail by now, for those reasons… BUT you CAN compile the latest kernel and all modules yourself (DON’T BE SHOCKED! YOU CAN DO IT! IT’S NOT ROCKET SIENCE!… just […]

yes ext3 is old – but it works and you can undelete files – which can come in handy – because nobody is perfect – except god – and nobody should assume he/she is god. it supports filesystems up to […]

update: 2024: since 2022 no need for addons, it is now a integrated feature of thunderbird. first of all – thanks for this cool mail client 🙂 Thunderbird NEEDS THE USER’S DONATIONS more than ever! checkout their blog and subscribe […]

Wifi Modes of an Access point: DLink has painted a nice overview over the possible different modes of an Accesspoint: cybersec: from great wifi modes that allow bridging two wifi networks, it would be GREAT if vendors test their products […]

this applies to: VirtualBox Version 5.1.8 r111374 (Qt5.3.2) hostnamectl Static hostname: DebianWorkstation Operating System: Debian GNU/Linux 8 (jessie) Kernel: Linux 3.16.0-4-686-pae Architecture: x86 the VMs hangs on startup with this screen: Solution: kill the vm then disable audio device… the […]

ome observers might well believe that the kernel has accumulated plenty of special-purpose virtual filesystems. Even so, 2.6.14 will include yet another one: securityfs. This filesystem is meant to be used by security modules, some of which were otherwise creating […]

the mail system is a very broken and corrupted system. sending-addresses can be forged – spam from all over the world is flooding the mailboxes – viruses get attached… nobody trusts attachments anymore. it’s a completely newly C++ developed mailserver […]

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 […]