Linux get email for SSH Logins

# get an email every time a user logs in through ssh
# www.fduran.com

# add in /etc/profile
echo "`whoami` logged in at `date` from `echo $SSH_CLIENT`" | mail -s "`hostname` login" youremail@example.com

# note this is not fool-proof. For example the user can run remotely a command thru ssh without logging in