In Bash, you can use the -z operator to check if a variable has a NULL value or not. The -z operator returns true if the length of the string stored in the variable is zero. Here is an example: # Declare a variable myvar=”” # Check if the variable has a NULL value if … Read more
LXD is a container hypervisor that uses the Linux Containers (LXC) technology. It allows you to create and manage containers, similar to virtual machines, but with a smaller footprint and faster performance. To create a snapshot of a container with the lxc command for LXD, you can use the following steps: First, open a terminal … Read more
There are several ways to determine if a Linux system is 32-bit or 64-bit. One way is to use the uname command with the -m option, which will print the machine hardware name of the system. If the output is “i686” or “i386”, the system is 32-bit. If the output is “x86_64”, the system is … Read more
To change the root password on macOS using the terminal, you can use the dscl command. Here are the steps: Open the Terminal application on your macOS system. Type the following command and press Enter: sudo dscl . -passwd /Users/root You will be prompted to enter the new password for the root user. Enter the … Read more
Installing a networked HP printer and scanner on Fedora Linux can be done using the hplip package, which is a collection of drivers and utilities for HP printers and scanners. Open a terminal and update the package list by running the command: sudo dnf update Install the hplip package by running the command: sudo dnf … Read more
MariaDB is a popular open-source relational database management system that is compatible with MySQL. To install MariaDB on OpenBSD, you can use the following steps: First, add the MariaDB package to your OpenBSD system by running the following command: pkg_add mariadb-server Once the package is installed, you can enable the MariaDB service by running the … Read more
Ansible is a popular open-source IT automation tool that can be used to manage and configure servers and other infrastructure. To install Ansible on Fedora 32, you can use the dnf package manager. Open a terminal and update the package list by running the command: sudo dnf update Install the Ansible package by running the … Read more
FFmpeg is a powerful multimedia framework that can be used to encode, decode, and manipulate audio and video files. To install FFmpeg on Fedora Linux 33/34 using dnf, you can use the following steps: Add the RPM Fusion repository to your system by running the following command: sudo dnf -y install https://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm https://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm … Read more
To install VirtualBox 6 on Fedora Linux 29, you can use the Oracle VirtualBox repositories. Here are the steps to install VirtualBox 6 on Fedora 29: Add the VirtualBox repository to your system by running the following command: sudo dnf -y install https://download.virtualbox.org/virtualbox/rpm/fedora/virtualbox.repo Import the Oracle public key by running the following command: sudo rpm … Read more
In Linux, you can use the “.” (dot) character at the beginning of a file or directory name to make it hidden. (https://spellpundit.com/) When a file or directory is hidden, it will not be displayed when using the ls command without the -a option (which shows hidden files) and by default in most file managers. … Read more