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time duration of being online of a particular user given the user name

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# 1  
Old 09-01-2011
time duration of being online of a particular user given the user name

in a multi user system of 3 users X,Y,Z, if i know that X is presently online, is it possible to determine for how long has he been online? i mean the time duration
# 2  
Old 09-01-2011
Doesn't 'who' say when they logged in?
# 3  
Old 09-02-2011
actually the problem with who is that if for example there is a user named Jonathan_Smith, then `who` does not display the full user name ..It only displays the 1st 8-9 characters. So if i redirect the output of `who` to a file then i cannot search for Jonathan_Smith in there as it would contain Jonathan_ or something like that
# 4  
Old 09-05-2011
UNIX user ids are unique in the first 8, last I checked, so you can search /etc/passwd or such with them.

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