I know the who command showing me all logged in users. But I want to somehow informed when someone but me loggs into my system. Any applet? Would also be nice if the applet shows the number of distinct users logged in, meaning having a login shell and established ssh connection.
For the part of notification when someone loggs in your system, you could try to put a little script in a /etc/profile.d script. Using notify-send (part of the libnotify-bin package) you could try this :
/etc/profile.d/notify_log.sh
notify-send -t 3000 "User logged in" `whoami`
and then, every time someone will log in your system you will be notified.
EDIT:
So, it doesn't work well :(
If you configured a mail server on your machine, you can use the mail command instead of notify-send.
But according to the post here, the better solution would be a pam_exec script.
