Using "su" on cygwin

[Maurício]

   Hi,

   I got my /etc/passwd and /etc/group from mkpasswd and mkgroup. When 
I'm loged as user, sometimes I need to get administrator privileges, for 
instance, to make and install a library or program. How do I do that? I 
tried:

su administrator

but it always says I'm using the wrong password (I use the same password 
I use to log as administrator). What am I doing wrong?

   Thanks,
   Maurício


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