Write just my current IP address to a text file?

[Fred Derf Veteran]

If there a way in Linux to output my current IP address to a text file?

ifconfig displays the IP address and I could redirect the output to a file but then I'd have to strip the junk. Is there a direct way to only write the current ip address?

Edit:

What I would really ultimately like to write would be:

dnscmd /recorddelete mydomain.ca ns2 a /f
dnscmd /recordadd mydomain.ca ns2 a xxx.xxx.xx.xxx

(where xxx.xxx.xxx.xxx = my current IP address)

[sfalcon]

  Quote

I'd like to have a text file that contained nothing other than "xxx.xxx.xxx.xxx"

I know there's plenty of guys on here with nothing buy XXX files. Surely you could borrow some?

Other than that, I can't think of a way to really do what you're asking. I'll poke around a bit.

Edited July 6, 2005 by SFalcon

[rezza Veteran]

dnscmd /recordadd mydomain.ca ns2 a `/sbin/ifconfig eth0 | grep addr | awk '{ print $2 }' | sed -e 's/addr://'`

...replacing eth0 with your external interface.

EDIT: This doesn't drop it to a text file, though... do you need that?

[Mike Douglas]

  rezza said:

dnscmd /recordadd mydomain.ca ns2 a `/sbin/ifconfig eth0 | grep addr | awk '{ print $2 }' | sed -e 's/addr://'`

...replacing eth0 with your external interface.

EDIT: This doesn't drop it to a text file, though... do you need that?

586169993[/snapback]

That should be:

/sbin/ifconfig eth0 | grep 'inet addr' | awk '{print $2}' | sed -e 's/addr://'

Otherwise, it might pick up your IPv6 line too.

[rezza Veteran]

  code_monkey said:

That should be:

/sbin/ifconfig eth0 | grep 'inet addr' | awk '{print $2}' | sed -e 's/addr://'

Otherwise, it might pick up your IPv6 line too.

586170058[/snapback]

True, I forgot about IPv6 because I don't use it... good point ;)

[Fred Derf Veteran]

  code_monkey said:

That should be:

/sbin/ifconfig eth0 | grep 'inet addr' | awk '{print $2}' | sed -e 's/addr://'

Otherwise, it might pick up your IPv6 line too.

586170058[/snapback]

You boys are fancy.

It looks like you are taking the verbose output from ifconfig and cleaning it.

Yea, I need to output it to a text file with a .CMD extension.

I want to write it to a SAMBA drive and then execute it as a batch file on a Windows Server box.

Basically I am trying to write my Linux IP address to the DNS service on my Windows box. Unfortunately, I am still much better with Windows.

I've been having a TERRIBLE time getting iptables/ipchains to forward traffic from the Linux box to the Windows box. However, I just found rinetd and I am again re-envigorated in my quest to have them work together properly.

[+BudMan MVC]

Um dude - Why not just make it a static entry in your windows dns? Where is the linux box getting its IP address from? Your dhcp? Your ISP?

[rezza Veteran]

  fred666 said:

You boys are fancy.

It looks like you are taking the verbose output from ifconfig and cleaning it.

Yea, I need to output it to a text file with a .CMD extension.

I want to write it to a SAMBA drive and then execute it as a batch file on a Windows Server box.

Basically I am trying to write my Linux IP address to the DNS service on my Windows box.  Unfortunately, I am still much better with Windows.

I've been having a TERRIBLE time getting iptables/ipchains to forward traffic from the Linux box to the Windows box.  However, I just found rinetd and I am again re-envigorated in my quest to have them work together properly.

586170485[/snapback]

ip=$(/sbin/ifconfig eth0 | grep 'inet addr' | awk '{print $2}' | sed -e 's/addr://')
echo "dnscmd /recorddelete mydomain.ca ns2 a /f" > something.CMD
echo "dnscmd /recordadd mydomain.ca ns2 a $ip" >> something.CMD

[Fred Derf Veteran]

  BudMan said:

Um dude - Why not just make it a static entry in your windows dns?? Where is the linux box getting its IP address from? Your dhcp?? Your ISP?

586171034[/snapback]

It's a dynamic IP from a backup internet provider.

I used to have a working solution when I had two Windows boxes.

The remaining Windows box has the static IP.

  rezza said:

ip=$(/sbin/ifconfig eth0 | grep 'inet addr' | awk '{print $2}' | sed -e 's/addr://')
echo "dnscmd /recorddelete mydomain.ca ns2 a /f" > something.CMD
echo "dnscmd /recordadd mydomain.ca ns2 a $ip" >> something.CMD

586171084[/snapback]

Thank you rezza. That looks perfect.