On the Linux systems there are three standard commands that show the information about last logged in users : last, lastb, andlastlog.

The output of these commands include : login-name, last login time, IP address, port etc.

And sometimes, to keep anonymity, it is required to erase last login history.

Command Logfile Description
last /var/log/wtmp Lists successful login/logout history
lastb /var/log/btmp Shows the bad login attempts
lastlog /var/log/lastlog Shows the most recent login

Remove Information About Last Logins

To remove all the information about the last logged in users, you have to clear the files where this information is kept :
echo > /var/log/wtmp
echo > /var/log/btmp
echo > /var/log/lastlog

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