UNIX for Advanced & Expert Users

Hi,

I would like to setup a FOR loop script to find out all the existing linux workstation in the network w/ ip address, hostname and linux version.

I created a basic FOR loop script:

for i in $(seq 1 254)
do
echo 10.72.169.$i >> result
ssh -o ConnectTimeout=3 root@10.72.169.$i "hostname" >> result
ssh -o ConnectTimeout=3 root@10.72.169.$i "cat /etc/redhat-release" >> result
done


However, the output is like this:

.
.
10.72.169.21
lumines.devo.ilx.com
Fedora Core release 5 (Bordeaux)
10.72.169.22
10.72.169.23
10.72.169.24
copper.devo.ilx.com
10.72.169.25
frogger.devo.ilx.com
Fedora Core release 5 (Bordeaux)
10.72.169.26
afterlife.devo.ilx.com
Red Hat Linux release 9 (Shrike)
10.72.169.27
10.72.169.28
molybdenum
Red Hat Linux release 9 (Shrike)
10.72.169.29
Red Hat Linux release 7.2 (Enigma)
10.72.169.30
.
.
.

I want the output to be like :

10.72.169.21 lumines.devo.ilx.com Fedora Core release 5 (Bordeaux)
10.72.169.22 abc.devo.ilx.com Fedora Core release 5 (Bordeaux)
.
.

I think with the command AWK, i can do that. But I don't know how to make it to work. Can someone show it to me?

Thanks
BEELOO

Code:

for i in $(seq 1 254)
do
    echo 10.72.169.$i `ssh -o ConnectTimeout=3 root@10.72.169.$i "hostname; cat /etc/redhat-release"
done >>result

Sorry, it doesn't work. it said:

test2: line 3: unexpected EOF while looking for matching `''
test2: line 5: syntax error: unexpected end of file

Yeah, sorry, I left that off, you need one more backquote at the very end of the long line.

First of all it's bad practice to allow root logins via ssh. You have been warned ...

There's a backtick (`) missing at the end of the echo line.

(a better looking option would be the following inside the loop (no redirection at the end of the loop then)

echo -n 10.72.169.$i >> result
ssh -o ConnectTimeout=3 root@10.72.169.$i "hostname; cat /etc/redhat-release" >> result

Yes, I aware that I shouldn't need to put the root in the script. Thanks for your reminder

Back to the script.

Now it print out all one lines and keep on going. However, I want the format to go like this

10.72.169.1 bomber.abc.com fedore core 5
10.72.169.2 bomber2.abc.com fedora core 7

So it will display the ip address first, then hostname, then version, and it will go for the next ip address with new line.

How can we do it?

Please advise.

Thanks
BEELOO

The echo should do that. Any newlines returned by the backticks are turned into whitespace by the shell (when they're unquoted). Usually that's not a good thing, but here's a good opportunity to take advantage of that feature.

You can redirect inside the script, still, of course; to me, it's more elegant to do that once, at the end. Saves from opening and closing the file repeatedly.