substring question

[Z.K.]

Within a Windows XP batch file I need to find a substring within a variable string and then do something if it is equal or not equal. Find and FindStr seem to only work with files so I was wondering just how to do this with a variable in an if statement.

 in the form :
   
      if %%G contains "command" (
       
          echo a message

      )

I have not been able to figure out how to do this in a batch file.   

[Reno]

1. echo %%g|find "command" >nul 2>&1 && echo a message
or
echo %%g|find "command" >nul 2>&1
if not errorlevel 1 echo a message

2. i assume you are inside a for loop, and has setlocal enabledelayedexpansion
set a=%%g
set a=!a:command=!
if "!a!" neq "%%g" echo a message

[Geek-9pm]

Hi, reno
please explain what is %%g mean?  Thanks

[Dias de verano]

Hi, reno
please explain what is %%g mean?  Thanks

It is a small relative of your %%G

[Reno]

Hi, reno
please explain what is %%g mean?  Thanks

      if %%G contains "command" (
          echo a message
      )

there is indention in the above code, i assume he is inside a for loop, %%g refers to token variable. besides for loop, i can't think anywhere else in coding a %%g can be used.

Code: [Select]

for /f "tokens=1*" %%f in (sometextfile.txt) do (
         echo %%g|find "command" >nul 2>&1 && echo a message
)
example text file:
this is a command

sample output:
c:>\test.bat
a message

for complete explanation, type for/?

[Geek-9pm]

Thanks, It said:

To use the FOR command in a batch program, specify %%variable instead
of %variable.  Variable names are case sensitive, so %i is different
from %I.


It also said the variable is onl a single letter.