Category: Fedora / RedHat / CentOS

You can use the yum command to install wireshark on RHEL yum install wireshark wireshark-gnome

yum search usbutils; # search for a package called like this usbutils.x86_64 : Linux USB utilities yum install usbutils.x86_64; # install

update 2022: build a Kindle like eBook reader 🙂 with this Display 🙂 (raspberry compatible) https://e-radionica.com/en/inkplate-6.html (that is the 6″ inch display) there is also a 10″ inch display https://e-radionica.com/en/blog/inkplate-10-crowdfunding-campaign-is-now-live/ https://www.crowdsupply.com/e-radionica/inkplate-6plus by TAVU Limited Liability Company for the Design and […]

update: 2019-02: everything was fine… until you decided to update because of the EthernalBlue exploit THAT ALSO AFFECTS OPEN SOURCE IMPLEMENTATIONS OF SMB 1.0! (WTF!? WHY?), samba now miss behaves on Debian and CentOS. (scroll down for details) EternalBlue, sometimes […]

updating LibreOffice (former OpenOffice) works like this: 1. remove the old version 2. download latest version https://www.libreoffice.org/ 3. install the new version RedHat Fedora CentOS7: rpm based distributions: yum remove libreoffice*; # uninstall current version wget http://mirror1.hs-esslingen.de/pub/Mirrors/tdf/libreoffice/stable/6.0.2/rpm/x86_64/LibreOffice_6.0.2_Linux_x86-64_rpm.tar.gz; # download tar […]

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 […]

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 […]

UPDATED! checkout vnc section of: https://dwaves.de/2018/05/07/getting-started-with-raspberry-pi-2-model-b-v1-1-vs-odroid-xu4-vnc-display-0-and-1/ UPDATED AGAIN! if you have problems connecting and get the error message: “x11vnc error: socket: Address family not supported by protocol (97)” then you probably have ipv6 disabled on the client. (and even if […]

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 […]

headless server: tested: 2018-10-17 on CentOS Linux 7.5 (Core) wget https://www.virtualbox.org/download/oracle_vbox.asc rpm –import oracle_vbox.asc cd /etc/yum.repos.d/ wget https://download.virtualbox.org/virtualbox/rpm/el/virtualbox.repo yum update yum search virtualbox yum install VirtualBox-5.2.x86_64 # if you want/need usb 3.0 extension package wget https://download.virtualbox.org/virtualbox/5.2.20/Oracle_VM_VirtualBox_Extension_Pack-5.2.20.vbox-extpack VBoxManage extpack install Oracle_VM_VirtualBox_Extension_Pack-5.2.20.vbox-extpack […]

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 […]

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 […]

checkout what is the latest version: ftp://ftp.cuhk.edu.hk/pub/packages/info-systems/www/squid/ probably this is more recent: https://github.com/squid-cache/squid you could also try git clone https://github.com/squid-cache/squid.git and compile with the git source tree… let me know if it worked. hostnamectl; # tested on [root@CentosMaster squid-4.0.21]# hostnamectl […]

i really don’t know why this is not a one-liner… it would save time and electricity and cause less searchengine-request. yum install epel-release yum install htop

i tried to compile under debian…. but it’s way more compli cated. also: you probably do not need all the packages stated here… but i did not have the time to sort those out sorry for that. feel free to […]

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 […]

exploits in software toplist: 2017: https://www.cvedetails.com/top-50-products.php?year=2017 All time: https://www.cvedetails.com/top-50-products.php That is why the Unix Philosophy of small, modular and beautiful matters … maybe that’s why Mr Stallmann prefers Microkernels… but well let’s be happy there is an alternative kernel to […]

strace from the strace.man.txt manpage. trace system calls and signals In the simplest case strace runs the specified command until it exits. It intercepts and records the system calls which are called by a process and the signals which are […]

… one also likes beauty and simplicity… this tutorial has not exactly grown into beauty – rather the beauty has grown into a beast and just as with software beyond a certain point – it needs to be split into […]

intro: it seems very relevant to have the late as possible kernel up and running: https://googleprojectzero.blogspot.com/2018/09/a-cache-invalidation-bug-in-linux.html first: backup your system! on boot time under “Advanced” you can chose to boot the old kernel – never the less – backup your […]

latest kernel related security problems can be found here… -> https://tracker.debian.org/pkg/linux newsletter subsribe: https://tracker.debian.org/accounts/login/ also https://anonscm.debian.org/cgit/kernel/linux.git http://www.securityfocus.com/ http://www.securityfocus.com/cgi-bin/index.cgi?c=11&op=display_threads&ListID=1&limit=30&offset=0&date=2017-06-20&mode=threaded https://cve.mitre.org/index.html https://twitter.com/CVEnew/ https://wiki.debian.org/DebianKernel

on the one hand – software biodiversity is good – if one system get’s hacked or virus infiltrated – the other’s – if “different enough” probably stay unaffected. on the other hand – if config files or procedures or command […]

debian has “codenames” for it’s releases… i always get confused which codename is what release number. with those commands you can easily identify both. hostnamectl seems to be the cross-distribution solution for that. user@suse12:~> hostnamectl Static hostname: suse12.domain Transient hostname: […]

in terms of security all i can say – stick to the UNIX principles of keeping things as “simple and beautiful” as possible. Simplification – redesign and rewriting complex grown structures always pays of in terms of efficiency and security. […]

naming why is a shell called a shell? after all it’s just a program 😀 call it program then 😀 kernel = core, shell = surrounding the core, interaction with the core. a shell is also a runtime-environment – a […]

by clicking on this link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git (wow! this truly shows the power of Open Source / Free Software… complete transparency in development process) problem: lawyers without social skills WILL destroy the planet and mankind and linux “Linux’s creator is stepping […]

TOS-based systems (Atari ST) used a row of bombs to indicate a critical system error. Number of bombs displayed revealed information about the error. The error (also called an exception) is reported by the Motorola 68000 microprocessor. The very first […]

usermod -s /bin/bash maria; # change login-shell of maria to bash usermod -s /bin/sh maria; # change login-shell of maria to sh # tested and works on debian8, suse12, centos7 usermod -s /bin/zsh maria; # change login-shell of maria to […]