What does 'man agetty' (or whatever you're using) on the OS in question say?
Ubuntu 14.04 doesn't list "\4{<nic>}" as an option and it doesn't work, 16.04 does and it does appear there (might have to press Enter to get a screen refresh).
If the OS doesn't support it then you'll have to get creative (send 'ip addr' output to /etc/issue at boot or periodically) to get what you want.
----- Original Message -----
From: "Arun Khan" <knura9 at gmail.com>
To: "centos" <centos at centos.org>
Sent: Monday, October 2, 2017 3:03:00 PM
Subject: [CentOS] Display IP addresses on the system console *before* the login prompt.
I have a bunch of VBox Linux VMs (CentOS 6/7, Debian7/8/9, Ubuntu
(14.0/16.04, Alpine) that get dynamic IPs. To get their respecitive
IP addresses I have to login and run 'ip addr'
I would like such info to be displayed on the VM console *before* the
login prompt. Ideally an ASCII log + info (see below sig line).
Thus, I can get the info from the VM console without having to login.
I read up on /etc/issue but adding "\4{eth0}" to the existing string
does not work.
TIA for solutions/pointers
-- Arun Khan
<console display>
_ _
| |__ ___ ___| |_ _ __ __ _ _ __ ___ ___
| '_ \ / _ \/ __| __| '_ \ / _` | '_ ` _ \ / _ \
| | | | (_) \__ \ |_| | | | (_| | | | | | | __/
|_| |_|\___/|___/\__|_| |_|\__,_|_| |_| |_|\___|
lo: 127.0.0.1
eth0: 10.1.1.122
kernel: 4.10.0-33-generic x86_64
login:
</console display>
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