deference between % !

i need to distinguish between  %variable% and !variable!
can any one till me in what they differ

!variable! is using delayed expansion

what do u men by delayed expantion
is it for geting system variablers that take delay to be returned

read this page

http://www.robvanderwoude.com/variableexpansion.html

i Appreciate ur help, its realy wonderful put can i ask for somthing else that is
the %~f0 and any other variables like it '%~'  and its meaning or give me webpage i can find them in 

type

Code: [Select]

for /?
at the prompt

thanks alot
u mean that in stead of putting the for loop variable 'I' put 0 and it will work out side the for loop like that
%~f0
instead of
%~fI inside the for loop

thanks alot
u mean that in stead of putting the for loop variable 'I' put 0 and it will work out side the for loop like that
%~f0
instead of
%~fI inside the for loop

You use letters of the alphabet %%a to %%z and %%A to %%Z for loop variables and you use figures %1 to %9 for parameters passed to the batch file from the command line. %0 has a special meaning, it expands to the batch file's own name.

thanks a lot
i appreciate ur help