Added in 1.9.0
/rename <filename> <new filename>
Renames a file or folder, can also be used to move a file or folder to another location.
-o - Overwrites the target file if it exists.
-f - Flushes copy to disk immediately.
<filename> - File/folder to rename or move.
<new filename> - New filename/foldername.
/rename E:\example.txt "E:\renamed with spaces.txt"