Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

getting dynamic ip on linux and pass to iptables script

Posted on 2013-06-17
3
Medium Priority
?
390 Views
Last Modified: 2013-06-17
Hi,

I need to pass IP to iptables script and tried below method, and it works:
/sbin/ifconfig eth0 | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}'

However, when I tried to use it in my script:
#!/bin/sh
IPT="/sbin/iptables"
IF=eth0
ETH0=/sbin/ifconfig eth0 | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}'

$IPT -A INPUT -s 0/0 -i $IF -d $ETH0 -p TCP --dport 22 -m state --state NEW -j ACCEPT

I keep getting:
eth0: not found

I missed out anything? Is this even the right way?

Thanks in advanced!
0
Comment
Question by:chainfear
  • 2
3 Comments
 
LVL 38

Accepted Solution

by:
Gerwin Jansen, EE MVE earned 2000 total points
ID: 39252659
Try putting your commands in the script either between back quotes or evaluating the result like this:

IPT=`/sbin/iptables`

or

IPT=$(/sbin/iptables)

In your case:

ETH0=`/sbin/ifconfig eth0 | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}'`

or

ETH0=$(/sbin/ifconfig eth0 | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}')
0
 

Author Comment

by:chainfear
ID: 39252763
thanks!!
0
 
LVL 38

Expert Comment

by:Gerwin Jansen, EE MVE
ID: 39252830
You're welcome :)
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Google Drive is extremely cheap offsite storage, and it's even possible to get extra storage for free for two years.  You can use the free account 15GB, and if you have an Android device..when you install Google Drive for the first time it will give…
In the first part of this tutorial we will cover the prerequisites for installing SQL Server vNext on Linux.
Learn how to get help with Linux/Unix bash shell commands. Use help to read help documents for built in bash shell commands.: Use man to interface with the online reference manuals for shell commands.: Use man to search man pages for unknown command…
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…
Suggested Courses
Course of the Month11 days, 8 hours left to enroll

916 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question