Get information on user login for linux

I want to check on log-in information, I follow some doc and add the following to the end of
/etc/profle

time=`date +%Y%m%d:%H%M%S`
echo "[$time]: $REMOTEHOST : $USER ." > /tmp/userlogin.log
mail -s "User Login !!" EMAILADDRESS < /tmp/userlogin.log
rm /tmp/userlogin.log

When I received the email, Subject reads OK.
However the body of the email contain only date time and user, the IP address it come from
is missing.  

Can anybody lighten me on this ?
ChanYiuPongAsked:
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Artysystem administratorCommented:
If users connect with 'ssh' then use $SSH_CLIENT instead of $REMOTEHOST.
BTW such kind of notification may be bypassed by clever users...
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ChanYiuPongAuthor Commented:
I think you get the 500 points, just one more question on SSH_CLIENT:
I saw a five digit between IP and port, what is that no ?
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Artysystem administratorCommented:
127.0.0.1 51133 22

127.0.0.1 - client's IP
51133 - client's port number
22 - server's port number
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