renumbers.cmd

@echo off
IF [%1]==[] (
echo renumbers.cmd filemask filename digits start digits start cycle
echo ~~~~~~~~~~~~~ bon_*.bmp     bon 2      1     1      1     4
echo               bon011.bmp bon012.bmp bon013.bmp bon014.bmp bon021.bmp bon022.bmp ...
echo ------------------------------------------------------------------------------------
) ELSE (
setlocal EnableDelayedExpansion

set prefix = %2
set /a digits = %3
set /a pstart = %4
set /a second = %5
set /a sstart = %6
set /a cycle  = %7


for %%a in (%1) do ( set /a i+=1 )
echo %1: !i!

set /a j = sstart
set /a i = pstart

for %%a in (%1) do (

set pre=00000000!j!
call set pre=%%pre:~-%digits%,%digits%%%

set suf=00000000!i!
call set suf=%%suf:~-%second%,%second%%%

set newname=%2!pre!!suf!

set /a i+=1
if !i! GTR !cycle! ( 
	set /a i=sstart
	set /a j+=1
)

echo %%a = !newname!
ren %%a !newname!.*
)
echo ------------------------------------------------------------------------------------
)