I have been searching for quite some time for an answer to my question. I have found several forums where my question was asked but never answered in a way I wanted to use. I run a spigot server with a world size larger then 50 GB. I know a large portion of the chunks and possibly several entire region files are chunks that are unchanged. People travel long distances on the server and simply walk through chunks without changing anything. I want these chunks gone. They can regenerate if someone visits them again. I am looking for a tool to find and delete these unchanged chunks and entire region files if nothing is changed in them. I have heard the worldborder answer. I don't want a border and I don't want to blindly delete everything outside of it. I have also found tools that search chunks for a list of block types and delete any other chunk. I don't like this answer either because of the potential to delete builds or old ruins. I have seen entire builds made of dirt. Also these tools have not been updated in a long time. Another problem I run into with most tools is the world size itself. Programs like NBTExplorer and MCEdit try to load the entire world and crash. I could load region files one at a time but there are tens of thousands of them. Compared to other servers(example 2b2t) my world file has to be small. I assume a tool like this would be useful to lots of server owners. Does a tool to perform this already exist? I realize it could take a long time to process a world of this size. I have no problems with that. Second request. NBTExplorer code is open source. Can someone add to it a function that is similar to Notepad++ Find in Files? I want to search my entire world but it would have to open region files one at a time and scan them and then output a list of all located instances. I have attempted to write it myself but I am not to savvy with that code. Any suggestions or input would be gladly appreciated. If there is an easy answer or something easy to find that I missed, feel free to point out my stupidity. I will appreciate that as well.