Category: GNU-Linux

lnav – like less but more colorful output of log files
03.02.2019

how to monitor all logs… https://dwaves.org/2017/06/15/linux-monitor-all-logs-in-real-time-d-follow-all-show-changes-to-log-files-under-varlog/ as i was wondering what combination of less -R with or without ccze would allow me to view log files colorful (because a desert of black and white… does not give you a good […]

The Y2038 Problem – cars and embedded systems
23.01.2019

in comparison to Y2K: „The issue became when it became 2000 because that would be stored as 00 in the program. This caused many to believe that say, bank software wouldn’t be able to get your money out because it […]

17.12.2018

Thanks! thanks to all the contributors of open source soft- and hardware and people that share their knowledge online for free 🙂 i hope/think that better technology could possibly also change humans to the better… freely sharing information surely does […]

Setup Bluetooth Headset under linux debian gnome2 mate desktop
23.08.2018

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 […]

apt yum exclude package from update upgrade
01.03.2018

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 […]

NMAP basic network scanning – overview over LAN
27.02.2018

What computers are online? What services/ports in what versions are online/open? over poorly or not so poorly documented LANs you can get an overview by using nmap. yum install nmap; # centos/redhatapt-get install nmap; # debian/ubuntu # get a quick […]

13.02.2018

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 […]

08.02.2018

… i never regret the learning curve of going Open Source. its not easier – but way more solid. order yourself a try without install boot stick today: http://linux-workshops.de/ideal-linux-stick/ if it does not boot – money back!

CentOS7 install ntfs support
02.02.2018

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 […]

Docker
29.01.2018

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 […]

linux bash bc – calculating with pi
27.01.2018

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 […]

gpg verify downloaded software – no public key
27.01.2018

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 […]

20.12.2017

on intel / amd cpus/boards: use lm sensors: 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; sleep 1; clear; done; service kmod […]

19.12.2017

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 […]

Linux CentOS7 install mate and virtualbox guest additions
17.12.2017

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 […]

Thunderbird Icedove Reorder Accounts
18.11.2017

first of all – thanks for this cool mail client 🙂 i really love icedove / thunderbird. A very cool feature that i am missing – it’s nice that imap can syn mail accounts – and i really love that […]

VirtualBox under LinuxDebian – Hang Hung VM on Starting Virtual Machine
02.11.2017

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 […]