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Which logfile in linux needs to be checked to find out the list of users who have been authenticated to the system?
/var/log/lastlog
/var/log/faillog
/var/log/wtmp
/var/log/messages
. /var/log/faillog - log file of unauthenticated logins
. /var/log/messages - system message log (dependent on distribution, may even be "messages.log") , shows all events during normal operation of a system including authenticated sessions
. /var/log/lastlog - On distributions such as CentOS, this is where the list of last-logged-in users resides, with login names, dates and times. Similar in functionality to /var/log/wtmp.
(EDIT: In light of that, I believe this question should be reworded as a multiple choice.)
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