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In Linux, which of these would show you the Logon and Logoff history information?
/etc/log
/etc/log/lastlog
/var/log/loginfo
/var/log/wtmp
This is located in '/etc/log/wtmp' file. The files /var/run/utmp and /var/log/wtmp contains logs for logins and logouts. These two files are binary files. You cannot see them with any text editor or pager like 'less'. Some commands use these files for their output. Man page: The wtmp file records all logins and logouts. Its format is exactly like utmp except that a null username indicates a logout on the associated terminal. Furthermore, the terminal name ~ with username shutdown or reboot indicates a system shutdown or reboot and the pair of terminal names |/} logs the old/new system time when date(1) changes it. wtmp is maintained by login(1), init(8), and some versions of getty(8) (e.g., mingetty(8) or agetty(8)). None of these programs creates the file, so if it is removed, record-keeping is turned off.
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