In Vim or vi text editor, you can search for a word in the following ways: Normal mode search: Press the / key to initiate a forward search. Type the word you want to search for. Press Enter to initiate the search. Press n to move to the next match, or N to move to … Read more

The error “resolvconf: Error: /etc/resolv.conf must be a symlink” occurs when the /etc/resolv.conf file on a Linux system is not a symbolic link, which is the expected configuration for systems using the resolvconf package. The solution to this error is to create a symbolic link for /etc/resolv.conf pointing to /run/resolvconf/resolv.conf. This can be done using … Read more

In VI or VIM, you can insert the current date and time by using the following command: Press the Esc key to enter normal mode. Type : to enter command mode. Type r followed by the current date and time in the format you want to use. For example, to insert the current date and … Read more

You can create custom 404 and 403 error pages in NGINX on Linux or Unix by following these steps: Create the error pages that you want to use. You can create these as HTML files and save them in a location that is accessible to NGINX. Open the NGINX configuration file: sudo nano /etc/nginx/nginx.conf In … Read more

A KVM virtual machine can use a shared physical network device (also known as bridging) with the host in order to access the network directly, rather than through the host as in a NAT configuration. This allows the virtual machine to have its own IP address on the network, allowing it to communicate directly with … Read more

You can flush the iptables rules under Ubuntu Linux using the following steps: Open a terminal window. Run the following command to flush all the iptables rules: sudo iptables -F This will remove all of the iptables rules and return the firewall to its default state, allowing all incoming and outgoing traffic. Alternatively, you can … Read more

You can delete multiple files in bulk in Unix or Linux using the following methods: Using the rm command: rm file1 file2 file3 … For example, to delete the files file1.txt, file2.txt, and file3.txt, you would run the following command: rm file1.txt file2.txt file3.txt Using wildcards: rm *.txt For example, to delete all .txt files … Read more

In bash, you can concatenate (combine) strings using the following methods: Using double quotes: string1=”Hello” string2=”World” result=”$string1 $string2″ echo $result # Output: Hello World Using single quotes: string1=’Hello’ string2=’World’ result=’$string1 $string2′ echo $result # Output: $string1 $string2 Using the + operator: string1=”Hello” string2=”World” result=”$string1″+”$string2″ echo $result # Output: HelloWorld In the first method, double quotes … Read more

You can use the iptables command to drop traffic from a specific IP address in Linux. Here’s how: Open a terminal window. Run the following command to block incoming traffic from the IP address: sudo iptables -A INPUT -s <ip_address> -j DROP Where <ip_address> is the IP address you want to block. For example, to … Read more

To rename image URL for a Content Delivery Network (CDN) usage in WordPress, you can use a plugin such as WP Offload Media Lite. This plugin offloads your media files to a cloud storage provider, such as Amazon S3, and serves them through a CDN. The plugin also automatically replaces the URLs of your media … Read more