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How To Clear btmp File

Running low on storage. Check the /etc/btmp file where failed login attempts are logged. This file may be very large:

The file can be cleared like this:

Credit for this goes to Tournas Dimitrios who has a great article on btmp:

https://tournasdimitrios1.wordpress.com/2010/12/28/how-to-clear-and-delete-last-logged-in-users-and-bad-login-attemps-log-wtmp-and-btmp/