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Display IP adresss at login screen (Ubuntu 14.04)

 
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# 1  
Old 07-20-2015
Ubuntu Display IP adresss at login screen (Ubuntu 14.04)
Hi I tried to follow

ifconfig - How can I display eth0's IP address at the login screen on Precise Server? - Ask Ubuntu

and

Show IP address of VM as console pre-login message

for some reason the above links did not work as advertised. E.g no ip address was displayed.

This is VM running under virtualBox and uname -a returns with

Code:
admini@myubuntuBox:~$ uname -a
Linux myubuntuBox 3.16.0-30-generic #40~14.04.1-Ubuntu SMP Thu Jan 15 17:43:14 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Any ideas what I might be doing wrong? Or another way to implement displaying the current ip address at the login screen. Feel free to ask any questions if or if you need more detail!
# 2  
Old 07-20-2015
Exactly what command are you using to try to get the IP address on your system?

If the command you are using pipes the output of ifconfig through something else to strip out the IP address, also show us the output from the ifconfig command in the pipeline.
# 3  
Old 07-20-2015
Quote:
Exactly what command are you using to try to get the IP address on your system?

Code:
admini@myubuntuBox:~$ /sbin/ifconfig eth0 | grep 'inet addr:' | cut -d: -f2 | awk '{ print $1}'
192.168.1.149
admini@myubuntuBox:~$

or

Code:
admini@myubuntuBox:~$ /sbin/ifconfig | grep "inet addr" | grep -v "127.0.0.1" | awk '{ print $2 }' | awk -F: '{ print $2 }'
192.168.1.149
admini@myubuntuBox:~$

full ifconfig
Code:
admini@myubuntuBox:~$ ifconfig
eth0      Link encap:Ethernet  HWaddr 08:00:27:b3:a2:cd
          inet addr:192.168.1.149  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:feb3:a2cd/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:339 errors:0 dropped:0 overruns:0 frame:0
          TX packets:203 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:32874 (32.8 KB)  TX bytes:21087 (21.0 KB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

admini@myubuntuBox:~$

Last edited by briandanielz; 07-20-2015 at 02:17 AM.. Reason: ifconfig
# 4  
Old 07-20-2015
OK. So you're getting the IP address you want. Is that correct?

So, are you saying that when you add that IP address to /etc/issue, you don't see it in your system's login prompt? Can you just add a test in your .profile (or the initialization file your shell runs when you login) to print the contents of /etc/issue if it exists?

Note that if you would show us the output from:
Code:
/sbin/ifconfig eth0

or:
Code:
/sbin/ifconfig eth0 | grep 'inet addr:'

we could change the multiple invocations of awk, cut, and grep in your pipelines into a single invocation of awk.
# 5  
Old 07-20-2015
What happens if you modify /etc/issue, e.g. by adding some arbitrary line? Does it display that modified text file?
# 6  
Old 07-20-2015
You can get the IP address you want from ifconfig using:
Code:
ifconfig eth0 | awk -F' +|:' '/inet addr:/ {print $4}'

without needing to invoke grep and cut.
# 7  
Old 07-20-2015
Quote:
Originally Posted by Don Cragun
OK. So you're getting the IP address you want. Is that correct?
Yes.

Quote:
Originally Posted by Don Cragun
So, are you saying that when you add that IP address to /etc/issue, you don't see it in your system's login prompt? Can you just add a test in your .profile (or the initialization file your shell runs when you login) to print the contents of /etc/issue if it exists?
Yes and I added the below to my .bash_profile

Code:
if [[ -f /etc/issue ]]; then
        cat /etc/issue;
fi

I get my usual MOTD and
Code:
Ubuntu 14.04.2 LTS \n \l

Last edited by briandanielz; 07-20-2015 at 08:31 PM.. Reason: typo
 
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