Category: Fedora / RedHat / CentOS


You can use the yum command to install wireshark on RHEL yum install wireshark wireshark-gnome it’s not just a tool…. IT IS A MOVEMENT 😀

Amazon kindle alternatives – great battery there is no off button – How to Connect Kindle with Linux CentOS Debian – manage Ebooks with Calibre

update 2022: build a Kindle like eBook reader 🙂 with this Display 🙂 (raspberry compatible) (that is the 6″ inch display) there is also a 10″ inch display by TAVU Limited Liability Company for the Design and […]

Samba4 on CentOS7 in under 10min – add windows file sharing user script – security – from SMB 1.0 to 2.0 – anti ETERNALBLUE EXPLOIT update trouble – SID “username” is not in a valid format – pdb_getsampwnam (tdb) error fetching database – solved

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 […]

HowTo Update OpenOffice LibreOffice under Linux – deb rpm Debian Ubuntu RedHat Fedora CentOS7

updating LibreOffice (former OpenOffice) works like this: 1. remove the old version 2. download latest version 3. install the new version RedHat Fedora CentOS7: rpm based distributions: yum remove libreoffice*; # uninstall current version wget; # download tar […]

apt yum exclude package from update upgrade

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 […]


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 […]

CentOS7 setup virtualbox

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

CentOS7 install ntfs support

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 […]

compiling squid http proxy from source

checkout what is the latest version: probably this is more recent: you could also try git clone 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

CentOS Redhat – compile Apache2 from source

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 […]

CentOS7 Security Profiles and Software Security Flaws TopList

exploits in software toplist: 2017: All time: 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 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 […]

Linux Kernel – Security Updates

latest kernel related security problems can be found here… -> newsletter subsribe: also


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: […]

watch linus torvalds work – lawyers try to destroy linux and the planet

by clicking on this link: (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 […]

system logging – log files – rsyslog rsyslogd

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 […]


# all these commands will modify /etc/passwd su – root # disable login for user usermod -s /usr/sbin/nologin username # change login-shell of username to bash usermod -s /bin/bash username # change login-shell of username to sh usermod -s /bin/sh […]