To manage the DHCPD (Dynamic Host Configuration Protocol Daemon) server on Fedora Linux, you can use the following commands: To restart the DHCPD server: $ sudo systemctl restart dhcpd To stop the DHCPD server: $ sudo systemctl stop dhcpd To start the DHCPD server: $ sudo systemctl start dhcpd These commands will allow you to … Read more

To clear the Squid proxy cache and re-create the cache directories, you can use the following steps: Stop the Squid service: $ sudo service squid stop Remove the cache directories: $ sudo rm -rf /var/spool/squid/* Re-create the cache directories: $ sudo squid -z Start the Squid service: $ sudo service squid start These steps will … Read more

To set up an Apache and PHP web server on OS X Mountain Lion 10.8, follow these steps: Install the Apache web server: Open Terminal. Run the following command to start the Apache web server: $ sudo apachectl start Install PHP: Download the PHP package from the official website. Install the package using the following … Read more

To sort the output of the ls command by last modified date and time, you can use the following command: $ ls -lt The -l option will list the files in long format and the -t option will sort the files by last modification time, so the most recently modified files will appear first in … Read more

To find a directory on a Linux-based system, you can use the find command. Here’s the basic syntax: $ find /path/to/search -name “directory-name” Replace /path/to/search with the path to the directory where you want to start the search and directory-name with the name of the directory you’re looking for. For example, to search for a … Read more

To set or change the $PATH variable in macOS, you can modify the .bash_profile file in your home directory. Open Terminal Open the .bash_profile file: $ nano ~/.bash_profile To add a new directory to the $PATH, add the following line: export PATH=$PATH:/path/to/new/directory Replace /path/to/new/directory with the actual path to the directory you want to add. … Read more

To force the installation of kept-back kernel packages in Ubuntu Linux LTS, you can use the following command: sudo apt-get install linux-image-generic-lts-<version> linux-headers-generic-lts-<version> Replace <version> with the desired version number. This command will install the latest version of the specified kernel packages, even if it’s being kept back. Note: Updating the kernel packages may require … Read more

To SSH into a Google Cloud Compute Engine instance, follow these steps: Open the Secure Shell Client Generate a new SSH key pair if you don’t already have one: $ ssh-keygen -t rsa Add your public key to the instance: Go to the Google Cloud Console. Select your project. Go to the VM instances page. … Read more

The OpenSSH config file is typically located at /etc/ssh/ssh_config and ~/.ssh/config. This file can be used to configure various options and settings for the OpenSSH client, such as setting a preferred port number, specifying private key files, enabling compression, and more. A common example of using the config file is to set up a shortcut … Read more

To change the password for a user over SSH, follow these steps: Connect to the remote Linux server using ssh: ssh username@remote-server-ip-address Run the following command to change the password: passwd You will be prompted to enter the current password and then the new password twice to confirm. After successfully entering the current and new … Read more