Depending on the method of installation, you might get Zabbix binaries and configuration files using either a dash (minus) or an underscore, as in the following:

•  zabbix_server versus zabbix-server
•  zabbix_agentd versus zabbix-agentd
•  zabbix_server.conf versus zabbix-server.conf

While Zabbix itself uses an underscore, many distributions will replace it with a dash to follow their own guidelines. There is no functional difference; you just have to keep in mind the character that your installation uses. In this book, we will reference binaries and files using an underscore.