To change the package mirror on OpenBSD, you can modify the ftp.conf file, which contains the URL of the package mirror. Here’s how to change the package mirror: Open the ftp.conf file:   sudo nano /etc/installurl Change the URL in the file to the desired package mirror:   http://ftp.openbsd.org/pub/OpenBSD Save the changes and exit the … Read more

You can delete files containing a character or number/digit in their filename using the find command and the rm command. Here is an example to delete all files containing a digit in their filename:   find . -type f -name “*[0-9]*” -delete Explanation: find .: Find files in the current directory. -type f: Find only … Read more

To set up the PF firewall on a FreeBSD system, follow these steps: Install PF:   # pkg install pf Enable PF on boot:   # echo pf_enable=”YES” >> /etc/rc.conf Configure firewall rules: Create a file named /etc/pf.conf and add the firewall rules. Here is an example configuration to protect a web server: # Interfaces … Read more

The route command is already installed and available on most Linux distributions, including CentOS and RHEL 7. To verify if it’s installed on your system, you can run the following command in the terminal:   route –version If the output shows the version of the route command, it means it’s already installed on your system. … Read more

To delete and remove files on Arch Linux, you can use the following methods: Using the rm command: The rm (remove) command is used to delete files and directories in Arch Linux. To delete a file, simply run the following command:   rm file_name Using the rm -r command: The rm -r (remove recursively) command … Read more

To remove a non-empty directory in Linux, you can use the “rm” command with the “-r” option for recursive deletion:   rm -r <directory_name> For example:   rm -r /path/to/non_empty_directory This will remove all files and subdirectories within the target directory. Be careful when using the “-r” option, as it can permanently delete large amounts … Read more

To find and replace text/IP address with Ansible, you can use the replace module. Here’s an example of how you can use it in a playbook:   – name: Replace text in file replace: path: /path/to/file regexp: ‘old_text’ replace: ‘new_text’ – name: Replace IP address in file replace: path: /path/to/file regexp: ‘old_ip’ replace: ‘new_ip’ In … Read more

To find disk I/O latency with the ioping monitoring tool on Linux, you can use the following steps: Install ioping: On most Linux distributions, you can install ioping using the package manager. For example, on Ubuntu, you can run sudo apt-get install ioping. Use ioping to measure disk I/O latency: To measure disk I/O latency, … Read more

This error message occurs when you try to delete a user account that is still being used by a running process. To resolve this issue, you need to first identify the process using the user account and then stop it before deleting the user account. Here is the process to resolve the error: Identify the … Read more

To install xfs utilities on Debian/Ubuntu Linux, you can use the following command:   sudo apt-get update sudo apt-get install xfsprogs To create an xfs file system on a disk or partition, you can use the mkfs.xfs command, followed by the disk or partition name. For example:   sudo mkfs.xfs /dev/sdb1 This creates an xfs … Read more