Need to watch log files in real time? Found the following tools quite useful for this.
Intall the following
apt-get install xwatch logtop whowatch
xwatch – great tool for xwindows, do: ssh -X mrfoo@myserver xwatch /var/log/auth.log or whatever log you want to follow
or use logtop
tail -f auth.log | logtop
Live update of who is logged in or logging in: