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Install, configure and use Zulip Chat Application on Ubuntu 20.04 LTS - Step by Step guide ?

This article covers how to easily install and configure the zulip chat application on your ubuntu Linux system. In fact, Zulip is a free and open-source chat application used for sharing private and public messages. It is a cross-platform software tool able to handle thousands of concurrent chat sessions. It can be integrated with GitHub, Jira, Stripe, Sentry, and more using third-party plugins. 


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Create a virtual machine in KVM on the command line

This article covers how to create and manage guest virtual machines on KVM from the command-line. In fact, KVM (Kernel based Virtual Machine) is an opensource virtualization technology built for Linux machines. It comprises a kernel module – kvm.ko which provides the core virtualization platform and a processor-specific module ( kvm-intel.ko for Intel processors or kvm-amd.ko for AMD processors ).


How to Install KVM, Qemu, virt-manager & libvirtd daemon ?

To install KVM and associated packages, run the below command:

$ sudo apt install -y qemu qemu-kvm libvirt-daemon libvirt-clients bridge-utils virt-manager

The command installs the following packages:

  • qemu-kvm –  This is the main KVM package that provides virtualization support.
  • libvirt – Includes the libvirtd daemon which supports creation and management of virtual machines.
  • libvirt-client – This package provides the virsh utility used for interacting with virtual machines.
  • virt-install – A utility that helps you to create virtual machines and install OS on those virtual machines from command line.
  • virt-viewer – A utility that displays the graphical view for the virtual machine.

Once installed, we need to confirm if the required kvm modules are loaded. Therefore, run the command:

$ lsmod | grep kvm

Additionally, confirm that the libvirtd daemon is running as follows:

$ sudo systemctl status libvirtd.service

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Install KeePass Password Manager on Ubuntu 20.04 - Step by step guide ?

This article covers how to install the KeePass Password Manager application on Ubuntu 20.04 system. In fact, KeePass Password Manager offers encryption algorithms AES-256, multiple User Keys, Portable version for Windows 10/7/8; Auto-Type, Global Auto-Type Hot Key, and Drag & Drop of passwords. The user can export saved passwords to TXT, HTML, XML, and CSV Files. If you are using LastPass, Bitwarden, Dashlane, AnyPAssword, Code wallet, and many others, then importing passwords from them is also possible in KeePass.

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bat command in Ubuntu 20.04 LTS Linux system – alternative to cat command

This article covers the best way of installing and using bat Command in Linux system. In fact, Bat is a drop-in replacement for the cat command, with some additional cool features such as syntax highlighting, git integration and automatic paging.

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sysctl command in Linux - Explained with examples

This article covers how to use the sysctl command in Linux through examples. In fact, sysctl is used to modify kernel parameters at runtime. The parameters available are those listed under /proc/sys/. Procfs is required for sysctl support in Linux.

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rm command in Linux - Explained with examples

This article covers how to use the rm command in Linux. In fact, the rm command is used for removing/deleting files and directories.


How to remove directories using rm command?

If you are trying to remove a directory, then you need to use the -r command line option. Otherwise, rm will throw an error saying what you are trying to delete is a directory:

$ rm -r [dir name]

For example:

$ rm -r testdir


How to make rm prompt before every removal ?

If you want rm to prompt before each delete action it performs, then use the -i command line option: 

$ rm -i [file or dir]

For example, suppose you want to delete a directory 'testdir' and all its contents, but want rm to prompt before every deletion, then here's how you can do that:

$ rm -r -i testdir

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