If you didn't notice, he said "with a command", so he would need a plugin, not just edit it in the server.properties file.
You make a plugin ? I'll look at this @Edit Nah, this plugin is not a lightweight =d too many features @_@ I want to disable/enable nether at fly by command ;P
At features i don't see nether option =d but i i'll look at this @Edit Nope, this plugin dont have it :S Ok, please close this topic i found other solution EDIT by Moderator: merged posts, please use the edit button instead of double posting.