$ mv 'Assignments' 'assignments' mv: cannot move `Assignments' to a subdirectory of itself, `assignments/Assignments'
Trying to rename
Assignments directory to
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The nuclear option is to start from scratch on this hard drive partition and OS installation by enabling OS X's Mac OS Extended (Journaled, case-sensitive) option. Be aware that this requires a complete reformatting of the disk and will clobber everything on the affected partition.
Another caveat is that certain applications in OS X do not place nicely with case-sensitive file systems. (At the time of this writing, I believe Steam is one of them.)
I just wanted to make readers of this question aware that this option does exist.
I personally resist the idea of the intermediary step and prefer to use the Finder to make such a change. It will not complain about the change if you rename the folder or file by just changing case.