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Tag Archives: Linux
firewalld on CentOS
firewalld is a Linux daemon used in managing firewall configuration. It is a free and open source solution provided by the https://firewalld.org/. firewalld is used as the default firewall solution by Red Hat Linux, CentOS and other distributions based on … Continue reading
The hosts file (Linux and Windows)
The hosts file exists in both, Linux and Windows. In Linux can be found at /etc/hosts, while in Windows is placed at %SystemRoot%\System32\drivers\etc\hosts. The hosts file is a plain text file, editable by any text editor such as nano or … Continue reading
Install NodeJS on Centos 8 Stream
Node.js is an open-source, cross-platform JavaScript run-time environment that executes JavaScript code outside of a browser. NOTE: Execute the following commands as root user or using sudo. Tested on: CentOS 8 Stream
The dnf Package Manager
dnf is a Package Manager or Package Management System for Red Hat Linux and Linux distributions derived from Red Hat Linux such as CentOS, Fedora, Rocky Linux and Alma Linux. A Package Manager, such as dnf is used by a … Continue reading
The yum Package Manager
yum is a Package Manager or Package Management System for Red Hat Linux and Linux distributions derived from Red Hat Linux such as CentOS, Fedora, Rocky Linux and Alma Linux. A Package Manager, such as yum is used by a … Continue reading
Install xrdp on CentOS 8
NOTE: Before installing xrdp add any secondary language you need to your system by using, NOT an RDP connection, but a direct access to it, i.e. through a console of the virtualization system if it’s a VM You may need … Continue reading
Install xrdp on Ubuntu 20.04
NOTE: Before installing xrdp add any secondary language you need to your system by using, NOT an RDP connection, but a direct access to it, i.e. through a console of the virtualization system if it’s a VM A glitch Switching … Continue reading
Add new user in CentOS with sudo permissions
Tested on: CentOS 8 Stream
How to list hardware on Linux – The lshw command
The lshw (List Harware) is a Linux command which provides detailed information on the hardware of a machine. Use the lshw command to see the exact memory configuration, storage devices, network interfaces, CPU version, etc. Many Linux distributions come with … Continue reading
Cross platform GUI application development with VSCode, .Net Core, C#, gtk3, gtksharp and Glade
Check also: Cross-platform Desktop applications using AspNet Core or plain static HTML files. It is possible to develop cross-platform desktop (GUI) applications, for Windows, Linux and macOS, using VSCode, .Net Core, C#, gtk3, gtksharp and Glade as GUI Designer. Windows … Continue reading
Install Mercurial Hg on CentsOS 7
Mercurial is a distributed revision-control tool for software developers. It is supported on Microsoft Windows and Unix-like systems, such as FreeBSD, macOS and Linux. mercurial-scm.org provides installation instructions. Open a terminal and type the following. Paste the following to the … Continue reading
Install MonoDevelop (Xamarin Studio) on CentOS 7
MonoDevelop (also known as Xamarin Studio) is an open-source integrated development environment for Linux, macOS,and Windows. Its primary focus is development of projects that use Mono and .NET frameworks. Installation instructions can be found at monodevelop.com. Open a terminal and … Continue reading
Create a desktop shortcut in CentOS 7
Open a terminal. Paste the following and save the file. Change the file permission. Tested on: CentOS 7.6 GNOME 3
Install Visual Studio Code on CentOS 7
Visual Studio Code or VSCode is a source code editor developed by Microsoft for Windows, Linux and macOS. It includes support for debugging, embedded Git control, syntax highlighting, intelligent code completion, snippets, and code refactoring. Installation instructions can be found … Continue reading
Install .Net Core SDK on CentOS 7
.NET Core is a free and open-source managed computer software framework for the Windows, Linux, and macOS operating systems. .NET Core fully supports C# and F#. Installation instructions can be found at microsoft.com. Open a terminal and type the following … Continue reading
Install Mono on CentOS 7
Mono is an open source implementation of Microsoft’s .NET Framework based on the ECMA standards for C# and the Common Language Runtime (CLR). Installation instructions can be found at mono-project.com. Open a terminal and type the following Tested on: CentOS … Continue reading
Set Desktop icon size on CentOS 7 (GNOME)
Use the dconf-editor to set the Desktop icon size in CentOS 7 with GNOME. dconf-editor should be at menu Applications | System Tools | dconf Editor If not there, then install it. Run dconf Editor and go to org | … Continue reading
Install Lazarus IDE on CentOS 7
Lazarus is a Delphi compatible cross-platform IDE for Rapid Application Development. Download Lazarus 2.0 from sourceforge.net. Your downloads folder should contain the following Open a terminal and type the following To run Lazarus from GNOME GUI, go to menu Applications … Continue reading
Install Polo file manager on CentOS 7
Polo is a nice file manager for Linux. The project’s page contains installation instructions. Download the appropriate polo-file-manager-vXXXX-amd64.run, from Polo releases page, where vXXXX is the version label. Then open a terminal, and execute the following To run Polo using … Continue reading
Install 7zip on CentOS 7
After configuring the EPEL repository in CentOS 7 you may install the 7zip package. After that the terminal displays enough information, incuding the following. Now you may proceed and install what you need. Here is a 7zip tutorial found in … Continue reading
Switching keyboard layout from English to Greek and vice versa, on CentOS 7
The /etc/X11/xorg.conf.d/00-keyboard.conf file, should be as following So, open a terminal and run the following to open the file with root permissions, edit it and save it. You can now switch between English and Greek keyboards, both in terminal and … Continue reading
Mouse problem on CentOS 7 with GNOME, running on VirtualBox
There is a mouse problem on CentOS 7 with GNOME, running on VirtualBox. Clicking the mouse does not move the focus to other applications, when more than one applications are running. There is bug ticket saying it has to do … Continue reading
Install Chrome on CentOS 7
Open a terminal and type the following. Paste the following to the file opened by gedit text editor. Save and close the gedit text editor. You can install Chrome now. Tested on: CentOS 7.6
Configure EPEL repository in CentOS 7
EPEL (Extra Packages for Enterprise Linux) is a package repository for RHEL (Red Hat Enterprise Linux) and CentOS, provided by Fedora team. EPEL provides packages that are not available in the official RHEL and CentOS repository. EPEL 7 is the … Continue reading
netstat on Windows (and Linux?)
Here is what MS Windows documentation says about netstat: “Displays active TCP connections, ports on which the computer is listening, Ethernet statistics, the IP routing table, IPv4 statistics (for the IP, ICMP, TCP, and UDP protocols), and IPv6 statistics (for … Continue reading
ipconfig on Windows (and Linux?)
Here is what MS Windows documentation says about ipconfig: “Displays all current TCP/IP network configuration values and refreshes Dynamic Host Configuration Protocol (DHCP) and Domain Name System (DNS) settings. Used without parameters, ipconfig displays the IP address, subnet mask, and … Continue reading
Setup MySql root password for the first time in Linux
MySql server administrator account is root. Right after MySql server installation the default root password is an empty string. Unless the package manager asks for a password during the installation. To set a root password, from its default empty string … Continue reading
Latest MySql Workbench crashes on Centos 7, downgrade to a previous version
After installing the latest MySql repository, I installed the MySql Workbench too. After the installation I went to try the application. But MySql Workbench refuses to execute and crashes. So I decided to do a downgrade to a previous MySql … Continue reading
Install latest MySql on Centos 7 Linux
Login as root or use the sudo command when executing the following commands. Latest MySql repositories can be found at https://dev.mysql.com/downloads/repo/yum/ At the time or writing this is the latest: mysql57-community-release-el7-11.noarch.rpm To download the repository, type the command: Prepare the … Continue reading
Apache multiple local virtual hosts on CentOS 7 Linux
Go to /etc/httpd/conf folder in order to edit the httpd.conf file. Find a line that sets the ServerName entry. Uncomment it (if it’s commented) and set it to a proper value. e.g. or There should be a DNS entry (somewhere … Continue reading
Teo's Notebook 