How to change file access permission?

I am not talking about chmod here. I need to change certain file or directory from root access to client's access.

Eg:
rwxr-xr-x 2 root root 12288 Nov 16 16:51 clientID/

change it to

rwxr-xr-x 2 userID userID 12288 Nov 16 16:51 clientID/

Currently my box is powered by redhat7.1.

Thanks in advance.

 

 

 

 

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