On CentOS Linux, you can install man pages using the package manager yum. Here’s how to install man pages on CentOS Linux 6/7/8/9: Open a terminal or SSH into your CentOS Linux machine. Update the package information to make sure you have the latest list of packages:   sudo yum update Install the man package … Read more

A “here document” is a way to specify multiple lines of text as the input to a command in a shell script. In a bash script, you can use a here document to write data to a file. Here’s an example of how to use a here document to write data to a file:   … Read more

Here are the steps to delete a user account on Ubuntu Linux: Log in as root or use the sudo command to run the following commands with administrative privileges:   sudo su Use the userdel command to delete the user account. Replace username with the actual username you want to delete:   userdel username By … Read more

Here are the steps to install Django 2 on Ubuntu 16.04: Install Python3 and pip3:   sudo apt-get update sudo apt-get install python3 python3-pip Create a virtual environment for your Django project:   sudo pip3 install virtualenv virtualenv myenv source myenv/bin/activate Install Django:   pip install django==2.0 Verify that Django is installed correctly:   django-admin … Read more

Keychain is a shell script that allows you to manage multiple ssh-agents and store the ssh keys for a user in one place. Here is how you can install and use Keychain on CentOS 6/7: Install the ‘keychain’ package:   sudo yum install keychain Start the ssh-agent:   eval $(keychain –eval –agents ssh id_rsa) Add … Read more

To hide the PHP version information from being displayed in the server response headers in Nginx, you can modify your Nginx configuration file. Here’s an example of how to do it: Open the Nginx configuration file:   sudo nano /etc/nginx/nginx.conf Add the following line inside the server block:   server_tokens off; Save the changes and … Read more

Bash provides several methods to extract substrings from strings. Here are a few commonly used methods: Using parameter expansion: Syntax: ${string:offset:length} offset is the starting position of the substring (0-based) length is the length of the substring Example:   string=”Hello, world!” echo “${string:7:5}” Output: world Using the cut command: Syntax: cut -c start-end start is … Read more

To use KVM cloud images on Ubuntu Linux, you need to have KVM virtualization software installed on your system. Here’s the step by step guide to use KVM cloud images: Install KVM and required utilities:   $ sudo apt-get install qemu-kvm libvirt-bin virt-manager Download the cloud image: You can download cloud images from various cloud … Read more

To install Redis server on Ubuntu Linux 16.04, you can use the package manager apt-get. Here’s the step by step guide: Update the package index:   $ sudo apt-get update Install Redis:   $ sudo apt-get install redis-server Verify the installation:   $ redis-cli ping PONG If you receive a PONG response, the Redis server … Read more

To flush all data from a Redis cache and delete everything, you can use the FLUSHALL command in the Redis CLI (command line interface). Here’s how to use the FLUSHALL command: Connect to the Redis CLI:   $ redis-cli Issue the FLUSHALL command:   127.0.0.1:6379> FLUSHALL OK The FLUSHALL command will delete all keys and … Read more