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I think you get the 500 points, just one more question on SSH_CLIENT:<br />
I saw a five digit between IP and port, what is that no ?
</div>


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 ?

<div>
127.0.0.1 51133 22<br />
<br />
127.0.0.1 - client's IP<br />
51133 - client's port number<br />
22 - server's port number
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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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<div class="content wysiwyg-content">
I want to check on log-in information, I follow some doc and add the following to the end of <br />
/etc/profle<br />
<br />
time=`date +%Y%m%d:%H%M%S`<br />
echo &quot;[$time]: $REMOTEHOST : $USER .&quot; &gt;&nbsp;/tmp/userlogin.log<br />
mail -s &quot;User Login !!&quot; EMAILADDRESS &lt;&nbsp;/tmp/userlogin.log<br />
rm /tmp/userlogin.log<br />
<br />
When I received the email, Subject reads OK.<br />
However the body of the email contain only date time and user, the IP address it come from <br />
is missing. &nbsp;<br />
<br />
Can anybody lighten me on this ?<br />

</div>
</div>


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 ?


Get information on user login for linux

The Linux operating system, in all its flavors, has its own share of security flaws that allow intrusions, but there are various mechanisms by which these flaws can be removed, generally divided into two parts: authentication and access control. Authentication is responsible for ensuring that a user requesting access to the system is really the user with the account, while access control is responsible for controlling which resources each account has access to and what kind of access is permitted.