China DOS Union

Question for batch experts: a DOS batch file problem ●●●●●●●●

I want to run a batch file on a schedule. When I run ipconfig, it looks like this:
Windows IP Configuration


Ethernet adapter Wireless Network Connection:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 218.29.153.103
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 218.29.153.254


I only want to output 218.29.153.103 into the text file ipconfig.txt and save it as a log!
What should I do?
Because the IP is assigned by DHCP, the line with 218.29.153.103 sometimes changes (because sometimes it disconnects and then reconnects).


The ideal effect for the ipconfig.txt log would be like this:
218.29.153.103
218.29.153.122
218.29.153.4
218.29.153.55
.
.
.
Please help, experts!

Originally posted by lxmxn at 2007-4-25 03:32 PM:
for /f "tokens=2 delims=:" %%a in ('ipconfig^|find /i "ip address"') do echo/%%a>>ipconfig.txt

Moderator, thanks! Awesome!

There's one thing I don't understand about for: what exactly does tokens=2 mean? If it means the 2nd line, I just can't make sense of it no matter how I think about it...

OP, please write your title properly and make it clear it's DOS batch. I came in and found it's actually CMD, what a mess.

Originally posted by BWSkyer at 2007-4-25 21:03:
There's one thing I don't understand about for: what exactly does tokens=2 mean? If it means the 2nd line, I just can't make sense of it no matter how I think about it...

tokens=2 means the second column. You can search the forum for posts about how to use the for command.