[windows batch] using variables in for loop

In a windows batch file (.bat or .cmd):

FOR /L %%i IN (1,1,5000) DO {

ECHO %%i

sleep -m 500

}

ref:

http://serverfault.com/questions/59014/for-loop-counting-from-1-to-n-in-a-windows-bat-script

http://blog.crankybit.com/why-that-batch-for-loop-isnt-working/