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The Curious Case Of HFS+



A strange and not very well known property of the HFS+ file system is that it is case preserving but case insensitive. In practice, this means it doesn’t care about the case when you type a command or a file name, but it will remember what you type. Let’s see an example:

$ echo Hello > TeSt
$ cat test
$ ls
total 17896
drwxr-xr-x   6 liv  staff      204 16 Mar 18:30 .
drwxr-xr-x  20 liv  staff      680 16 Mar 00:01 ..
-rw-r--r--   1 liv  staff        6 16 Mar 18:30 TeSt