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The server I administrate, inconveniently enough, has a dynamic IP address assigned by DHCP. The convenient counterbalance, though, is that it happens to be set up about two feet from where I sit. I know how to edit /etc/issue to show different values before the login prompt is delivered to the display, but I'd like to know if it's possible for /etc/issue to display the current IP address of eth0 (re-evaluated at boot time) so that I can see it and then ssh in without having to log in to run ifconfig.

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Can conky be used in the login screen? If so you could make all sorts of info handy. – dibs Nov 15 '12 at 1:07
up vote 5 down vote accepted

/etc/issue is unfortunately a plain text, it has some options you can add to it (see man agetty) but not the IP Address of eth0..

If you put this in /etc/rc.local:

IP=$(/sbin/ifconfig eth0 | grep 'inet addr:' | cut -d: -f2 | awk '{ print $1}')
echo "eth0 IP: $IP" > /etc/issue

Then you will see something like this:

myServer login:
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Works flawlessly! Thanks. – ssonicblue Nov 16 '12 at 7:12

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