Category: Fedora / RedHat / CentOS

GNU linux time zones – change timezone

file access modify creation time will always be in UTC format. In which time offset is +hours or -hours from Longitude: 0° (Prime Meridian) Prime meridian (Greenbich) GPS: 0° 00′ 05.3101″ W Other names: Z / Zulu Time Zone Time […]

Yum cheat sheet – the future of Yum is Dnf

update: 2021-1 yum -> dnf hostnamectl; # tested on Virtualization: kvm Operating System: CentOS Linux 8 CPE OS Name: cpe:/o:centos:centos:8 Kernel: Linux 5.4.11 Architecture: x86-64 ll /usr/bin/yum -> dnf-3 all those yum commands still work with dnf (nice work!) DNF […]


there are plenty 😀 debian8.8 [cc lang=”bash” escaped=”true” width=”600″] uname -a; # tested with Linux debian 3.16.0-4-686-pae #1 SMP Debian 3.16.43-2 (2017-04-30) i686 GNU/Linux find / -type d -iname bin /bin /usr/local/bin /usr/bin /usr/share/doc/libintl-perl/examples/simplecal/bin /usr/lib/klibc/bin [/cc] suse12 [cc lang=”bash” escaped=”true” […]


rpm is a powerful Package Manager for Red Hat, Suse and Fedora Linux. It can be used to build, install, query, verify, update, and remove/erase individual software packages. A Package consists of an archive of files, and package information, including […]


su; # become root yum install kernel-devel # get kernel source # kernel sources will be copied to /usr/src/kernels/3.10.0-514.16.1.el7.x86_64/ # there is a broken softlink in # /usr/src/kernels/3.10.0-514.el7.x86_64 # -> # /usr/src/kernels/3.10.0-514.16.1.el7.x86_64/ # which you will have to fix like […]

linux CentOS7 – install MATE Gnome2 based Desktop

yum install epel-release yum groupinstall “X Window system” yum groupinstall “MATE Desktop” # immediately switch over to grafical gui (if possible) systemctl isolate; # Tell your systemd to start the per default after boot unlink /etc/systemd/system/; ln -s […]


what real value can add linux to mankind? efficiency – less power consumed – less waste – because it runs well on old hardware as well transparency – should actually dissalow tyrannie and dictatorship – because you SHOULD acutally be […]


you can check your machine’s current ip with: ip addr show to modify your network interface address setting simply use the nmtui tool: this failed me once with “no Update2” method… so let’s move on to the… manual way: terminal […]

Debian8.7 vs CentOS7 vs. SUSE12 – kernel version – filesystem – directory structure – RAM memory usage

it is interesting to see what kernel+filesystem the distributions rely on. Kernels: While CentOS is still on 3.10, Debian is believing in 3.16, and SUSE is “latest” with it’s 4.4 Version kernel. you can upgrade with Debian to […]

How to monitor system temperature CPU HD Harddisk read hardware Sensors on Linux

monitor (andoird) devices with bpf: How to monitor system temperature on Linux Last updated on November 7, 2013 Authored by Dan Nanni 10 Comments Creditz: In most cases, you are not supposed to be worried about the temperature […]


cmatrix now also for centos redhat and suse12! 😀 the probably most important linux program in cyberspace…. and neither centos nor suse have it in their repositories. shame! 😀 matrix just changed color 😀 if you wanna feel like a […]


what rkhunter is also doing nicely… it keeps a hash of every file on your system… and if this file changes… you will get noticed. rkhunter (Rootkit Hunter) is a Unix-based tool that scans for rootkits, backdoors and possible local […]


update: 2018.04 PaleMoon archive Server HACKED! “A malicious party gained access to the at the time Windows-based archive server” (src) oh gosh! ? GO USE CENTOS DEBIAN AND LATEST KERNEL NOW! “malware dropper tracked by ESET as Win32/ClipBanker.DY” (steals bitcoins) […]


tested on: Linux Debian 3.16.0-4-686-pae #1 SMP Debian 3.16.7-ckt25-2+deb8u3 (2016-07-02) i686 GNU/Linux #install software #centos7 yum update && yum install samba-client samba-common cifs-utils #debian apt-get update && apt-get install cifs-utils mkdir /mnt/cifs; # create mountpoint mount -t cifs //FILE-SERVER-IP-ADDRESS/NAME_OF_SHARE /mnt/cifs […]

GNU Linux -> List all open ports and listening services /etc/services

what service/program is using what port: # list all open ports and listening services/programs lsof -i -P -n; web gui based -> watch traffic on terminal -> resource monitoring -> collectd/ nmap returns a nice overview… but […]


add user to group # official, cross distribution (tested with suse12, centos7, debian8) usermod -a -G GROUPNAME USERNAME # redhat/centos: usermod -a -G wheel user; # add user „user“ to group „wheel“ in order to allow user to use sudo […]