Using variables in cmd command

Green vegetables

I'm trying to make a batch program that takes variables from basic CMD commands. E.g:

c:\Users> ipconfig
.....
IPv4 Address ....... 123.456.7.89
.....

Suppose I want to make a batch program that just prints the IP address on the screen like:

@echo off
echo (IP Address Variable Here)
pause;

what should I do?

thank you for your time.

David Postiel

I want to make a batch program that just prints the IP address on the screen

Use the following batch file.

GetIPAddress.cmd：

@echo off
setlocal enabledelayedexpansion
rem throw away everything except the IPv4 address line 
for /f "usebackq tokens=*" %%a in (`ipconfig ^| findstr /i "ipv4"`) do (
  rem we have for example "IPv4 Address. . . . . . . . . . . : 192.168.42.78"
  rem split on : and get 2nd token
  for /f delims^=^:^ tokens^=2 %%b in ('echo %%a') do (
    rem we have " 192.168.42.78"
    set _ip=%%b
    rem strip leading space
    set _ip=!_ip:~1!
    )
  )
echo %_ip%
endlocal

notes:

  • The desired value is stored in_ip

Usage example and output:

F:\test>ipconfig | findstr /i "ipv4"
   IPv4 Address. . . . . . . . . . . : 192.168.42.78

F:\test>GetIPAddress
192.168.42.78

Further reading

  • A-Z Index of Windows CMD Command Line - Excellent reference for all things Windows cmd line related.
  • enabledelayedexpansion - Delayed expansion will cause the variable to be expanded at execution time rather than at parsing time.
  • /f - loops commands against the result of another command.
  • ipconfig - configure IP (Internet Protocol Configuration)
  • set - Show, set or delete CMD environment variables. Changes made with SET will only persist during the current CMD session.
  • setlocal - Set options to control the visibility of environment variables in batch files.
  • variable - extracts a part (substring) of a variable.

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