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i know,when i login as root and tty=/dev/syscon,then su to a regular user like test1

then
$who am i
test1 /dev/syscon time



it should echo root,but it echo test1.

Platform: Solaris 10 sparc.
when i logon as root,then su - user2,user2 is regual user
when i type "who am i "command it should echo root,but now it echo user2
by the way,when i type command "tty" ...