pętla for w DOSie

Something along the lines of FOR( i = 1; i <= n; i++ ) can be done using a bang counter ('!' is the "bang" character - though any character can be used, '!' is sort of customary):

 set n=%1
set i=
:loop
set i=%i%!
   code to do something repetitive
if %i%==%n% goto end
goto loop
:end