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How to restart CentOS or RHEL server safely
The "shutdown -r now" command is used to safely reboot a CentOS or RHEL server. The "-r" flag indicates that the system should reboot after shutting down all processes. The "now" argument tells the system to initiate the shutdown and reboot immediately. Before running the command, it's a good pra
How to write FreeBSD image to USB disk for installation using dd command
Here are the general steps to write a FreeBSD image to a USB disk using the dd command:rn rn Insert the USB drive into your computer rn Determine the device name of the USB drive by running the command lsblk . The device name will be something like /dev/da0 or /dev/sdb . Be very careful to select th
How to configure Intel Wifi on Debian Linux when you get firmware: failed to load iwlwifi-8265-36.ucode error
To fix the "firmware: failed to load iwlwifi-8265-36.ucode" error when configuring Intel WiFi on Debian Linux, you can try the following steps:rn rn Make sure that the non-free firmware package is installed by running apt-get install firmware-iwlwifi rn If the package is already installed, try reins
OpenSUSE install Brotli module for Nginx
To install the Brotli module for Nginx on OpenSUSE, you will need to first add the Nginx repository to your system by running the following command: n n n sudo zypper addrepo -f https://nginx.org/packages/opensuse/15/x86_64/ nginx n n n Then, you can install the Nginx package with the Brotli module
How to set up FreeBSD 12 VNET jail with ZFS
Here are the general steps to set up a VNET jail on FreeBSD 12 using ZFS:rn rn Create a ZFS dataset for the jail: zfs create -o mountpoint=/jails zpool/jails/jailname rn Create the jail with VNET enabled: jail -c name=jailname host.hostname=jailname vnet vnet.interface=igb0 rn Install the base syste
How to declare Boolean variables in bash and use them in a shell script
In Bash, you can declare a Boolean variable using the declare or typeset command, followed by the variable name and the value. For example, to declare a variable called "flag" and set it to true, you would use the following command:rn rn rn flag= true rn rn rnYou can also use the -g option to make t
How to configure Intel Wifi on Debian Linux when you get firmware: failed to load iwlwifi-8265-36.ucode error
To fix the "firmware: failed to load iwlwifi-8265-36.ucode" error when configuring Intel WiFi on Debian Linux, you will need to install the firmware-iwlwifi package. Try running the following command as root:rn rn rn apt - get update && apt - get install firmware - iwlwifirn rn rnThen reb
How to create MySQL admin user (superuser) account
To create a new MySQL admin (superuser) account, you can use the following steps:rn rn Log in to the MySQL shell as the root user: rn rn rn rn mysql -u root - p rn rn rn rn Create a new user with the desired username and password, and grant them all privileges: rn rn rn rn GRANT ALL PRIVILEGES ON *
How to find NetworkManager version on Linux
rn rn rn rn rn networkmanager --version and nmcli -v are command line instructions that can be entered into the terminal on a Linux system. They are used to display the version number of NetworkManager that is currently installed on the system. NetworkManager is a service that manages network c
Linux Filesystem Error: Transaction failed when using LXD
This error message typically indicates that there was an issue with a filesystem operation performed by the Linux container manager LXD. The specific cause of the error can vary, but some common reasons include:rn rn Insufficient storage space on the host machine rn Permission issues with the contai
How to check memory utilization and usage in Linux
There are several ways to check memory utilization and usage in Linux:rn rn free command: The free command is used to check the total amount of free and used physical and swap memory in the system, as well as the shared memory and buffers used by the kernel. rn rn rn rn $ free -mrn rn rn rn top comm
How to check if file does not exist in Bash
You can check if a file does not exist in Bash by using the ! -f or ! -e operator. For example: n n n if ! ; then n echo "File does not exist" n fi n n n Or n n n if ; then n echo "File does not exist" n fi n n n Both of these commands will check if the file located at “/path/to/file” do
How to reset WordPress password using MySQL CLI
You can reset a WordPress password using the MySQL command-line interface (CLI) by following these steps:rn rn Log in to the MySQL CLI as the root user: rn rn rn rn mysql -u root - p rn rn rnYou will be prompted to enter the root password.rn rn Select the WordPress database: rn rn rn rn use database
How to import WireGuard profile using nmcli on Linux
You can import a WireGuard profile using the nmcli command on Linux by following these steps:rn rn Create a new connection profile using the nmcli command: rn rn rn rn nmcli connection import type wireguard file /path/to/profile.confrn rn rnThis will import the WireGuard profile from the specified f
How to remove carriage return in Linux or Unix
There are several ways to remove carriage returns (also known as "line endings" or "newline characters") in Linux or Unix. Some common methods include:rn rn Using the "tr" command: rn rn rn rn tr -d '' < input .txt > output .txtrn rn rnThis command uses the "tr" (translate) command to delete a
How to password protect directory with Nginx .htpasswd authentication
To password protect a directory with Nginx using .htpasswd authentication, you can follow these steps:rn rn Create a .htpasswd file that contains a list of username and password pairs. You can create this file using the "htpasswd" command. For example: htpasswd -c /etc/nginx/.htpasswd user1 rn Add t
How to check if bash variable defined in script
You can check if a variable is defined in a bash script by using the "if " or "if " command. For example, if you want to check if a variable named "var" is defined, you can use:rn rn rn if ; then rn echo "var is not defined" rn else rn echo "var is defined" rn fi rn rn rnorrn rn rn if ; then rn e
How to install Linux VM on FreeBSD using bhyve and ZFS
bhyve is a hypervisor for FreeBSD that allows you to run virtual machines (VMs) on top of a FreeBSD host. You can use bhyve and ZFS to install a Linux VM on a FreeBSD host. Here are the general steps to do this:rn rn Create a ZFS pool on the host system: rn rn rn rn zpool create -f mypool /dev/ada0r
How to install Homebrew on Mac OS to use the brew package manager
Homebrew is a package manager for Mac OS that allows you to easily install and manage software packages. To install Homebrew on Mac OS, you can use the following steps:rn rn Open the Terminal application on your Mac. rn Run the following command in the terminal to install Homebrew: rn rn rn rn /bin/
How to set up static IP address on Debian Linux 10/11
Homebrew is a package manager for Mac OS that allows you to easily install and manage software packages. To install Homebrew on Mac OS, you can use the following steps:rn rn Open the Terminal application on your Mac. rn Run the following command in the terminal to install Homebrew: rn rn rn rn /bin/
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