I'm not sure if any one else had this problem, but this is a problem I had:
I'm using Solr 6.4.1, on Windows, and when would run 'bin\solr delete -c <core_name>', it wouldn't work properly. It turned out it was because there was a space character which shouldn't have been there at the end of line 1380 in the solr.bat file. I'm not sure if that's the way it came or if maybe I had accidentally added that space at some point, though I don't seem to remember doing anything like that. After removing that space, the delete command works fine. Regards
