Definition: ".1013_group_news.conf" is a configuration file used in Linux for setting up group news feeds for multiple groups on a Linux server. It's typically located in /etc/group_news.conf or /etc/securegroup_news.conf, depending on which operating system your server uses. This file allows you to define the URL of each group feed, which can then be configured to display specific content based on the user's settings. The '1013' in the name is a placeholder for a number that represents the number of groups (groups = 0-9) that are subscribed to this news feed.