Changing filenames from Greeklish => Greek (subprocess complain)

[Νικόλαος Κούρας]

One of my Greek filenames is "Ευχή του Ιησού.mp3". 
Just a Greek filename with spaces. 
Is there a problem when a filename contain both english and greek letters? 
Isn't it still a unicode string? 

All i did in my CentOS was 'mv "Euxi tou Ihsou.mp3" "Ευχή του Ιησού.mp3" 

and the displayed filename after 'ls -l' returned was:

is -rw-r--r-- 1 nikos nikos 3511233 Jun 4 14:11 \305\365\367\336\ \364\357\365\ \311\347\363\357\375.mp3

There is no way at all to check the charset used to store it in hdd?
It should be UTF-8, but it doesn't look like it.
Is there some linxu command or some python command that will print out the actual encoding of '\305\365\367\336\ \364\357\365\ \311\347\363\357\375.mp3' ?