If I for example want to know how many times a user has logged in, how can I go about this in a simple or awesome way ?
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For some very basic login information, you can use the last command. For instance:
root@web-02:~# last root
root pts/0 109.60.147.140 Wed Dec 2 10:49 still logged in
root pts/0 109.60.147.140 Wed Dec 2 10:49 - 10:49 (00:00)
wtmp begins Tue Dec 1 17:22:59 2015
Notice the history only goes back so far as the logs get rotated. You can also look at older logs by specifying the file:
root@web-02:~# last -f /var/log/wtmp.1
root pts/0 109.60.147.140 Wed Nov 18 11:21 - 11:23 (00:02)
root pts/0 109.60.147.140 Fri Nov 13 10:42 - 10:42 (00:00)
wtmp.1 begins Fri Nov 13 10:42:21 2015
For even more information, you can inspect /var/log/auth.log It will also contain information like failed login attempts.
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