cp /path/to/file/filename /new/path/filename
mv /path/to/file/filename /new/path/filename
cp just copies, mv actually moves it ie original is 'deleted'.
However(!) in either case you need sufficient rights to do this.
Who are you trying to do this as and what do the ownerships/perms look like on the file?
ls -l /path/to/file/filename
That's a lowercae L switch there & substitute the actual path & filename of the real file...