what does "s" stand for in the permission list -rwsr-sr-x?

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# 1  
Old 08-21-2009
Question what does "s" stand for in the permission list -rwsr-sr-x?

I have a permission like this. What does s stand for and how do we represent this in numbers? like 755, 744 etc.,
# 2  
Old 08-21-2009
Search for set user id and have a read of this:

setuid - Wikipedia, the free encyclopedia

# 3  
Old 08-21-2009
It means that the setuid and setgid bits have been set.
chmod 6755  file

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