how to create a root equivalent user in linux?

[M E Fieu]

Hi.. I want to create a user account in linux that have root right to do everything.  Is that possible?  I have done the following
 
in /etc/passwd    0 is the GID of root
tong:x:512:0::/home/tong:/bin/bash
 
in /etc/group
tong:x:0:root
 
but still doesn't work, any advice?
 
 
 

		
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