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Real and Effective IDs

 
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# 1  
Old 10-24-2011
Real and Effective IDs
Can anyone explain me in details of Real and Effective IDs
# 2  
Old 10-24-2011
Code:
et35:/export/home/devac $ who am i
vbe        pts/33       Oct 24 15:39    (ant.xxx.ch)   # Real ID
et35:/export/home/devac $ /usr/ucb/whoami
root                                                  # Effective ID

# 3  
Old 10-24-2011
So the real ID is when you connect yourself

But if you change personality e.g using su you "become" newID which is the effective ID, for whatever you execute from now will be " as newID " and not your loginID, till you exit and become again yourself
# 4  
Old 10-24-2011
Okk, So how can we see whether we are in real user id or effective user id.So groud id also changes accordingly rgt?
And in saved user id it will store the real userid right?
# 5  
Old 10-24-2011
Yes I showed you in previous post use whoami to see effective ID and "who am i " or logname to see real ID
# 6  
Old 10-24-2011
thanks....that was gr8
# 7  
Old 10-24-2011
Quote:
Originally Posted by vbe
So the real ID is when you connect yourself

But if you change personality e.g using su you "become" newID which is the effective ID, for whatever you execute from now will be " as newID " and not your loginID, till you exit and become again yourself
Why is this necessary when you could just exit and be yourself if there was no effective-user?
 
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