strange directory problem

["Kelvin Cheung" <kg_zhang@xxxxxxxxxxx>]

hello,erverbody.
I met a strange problem. When creat a directory with all letters 
capitalized, the system will turn it into all small letters.

[root@localhost doc]# mkdir DOC
[root@localhost doc]# ls
doc

This often make mistakes when I compile programs. 
Please help me, thanks very much.

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