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
Normally we know when we create one file in Linux, the file's owner and group will set with the creator. For example, I have one user usera, after I execute
usera@srv1:$touch a.txt
I will find the owner of this file will be usera, just like
usera@srv1:$ll
-rw-r--r-- 1 usera usera 0 2012-07-25...