Substitute-User or Super-User ?

[S Ramakrishnan]

I always thought 'su'  was a 'substitute user' command. Its seems
apt also, since it allows the current USER to be changed to the
specified user-id. Of course, default value of this parameter is
root.

That being so, why do so many reputed (?) shell programming books 
describe 'su' as 'super user' command  ('becoming a super user -- su').
Was it originally meant to be become-superuser command ?

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    S.Ramakrishnan, CS Dept, McBryde Hall, VaTech, Blacksburg, Virg. 24061-0106
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