lastb - Shows failed login attempts. This command requires the file /var/log/btmp to exist in order to work. Type "touch /var/log/btmp" to begin logging to this file.
Executing lastb as root will yield the following, automatically creating the file /var/log/btmp.
[root@zanzibar proc]# lastb
btmp begins Fri Sep 17 22:48:12 2004
Have a look at the manpage.
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