Use the hosts file to block access to sites in Linux Here’s how you can use the hosts file to block access to web sites in Linux. 1. Open a terminal window. 2. Type in the following command to back up your hosts file, then hit Enter: sudo cp /etc/hosts /etc/hosts.bak 3. Type in the following command to block Facebook, for example: sudo sh -c ‘echo “0.0.0.0 http://facebook.com” >> /etc/hosts’ 4. If you prefer to use a different method, use this command: sudo sh -c ‘echo “127.0.0.1 http://facebook.com” >> /etc/hosts’ To block a different site, just replace facebook.com in the command. Read more: Linux G Technology IndustryOpen Source