Among those parameters is the interactive login parameter (shortened to il). When set to true, you will be prompted with the familiar login mechanism that we've seen in many other recipes:

Your new command line should look like this:

CrmSvcUtil.exe /namespace:Packt.Xrm.Entities /out:Entities.cs /language:CS /serviceContextName:OrganisationServiceContext /il:true

This is good practice if you do not want to have your password displayed in plain text; however, as a compromise, you'll have to deal with the login prompt and enter the details somehow.