On the Linux systems, there are three standard commands that show the information about last logged in users: last, last, and last log.
The output of these commands includes login-name, last login time, IP address, port, etc.
And sometimes, to keep anonymity, it is required to erase last login history.
|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