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Submetido pelo brackhat:

Num batch file:

C:\>type arv.bat
@echo off
set arv=*****&cmd.exe /v:on /C "for /L %%n in (1,1,5) do @echo !arv:~-%%n!"
C:\>arv
*
**
***
****
*****
C:\>

Em command line:

C:\>set arv=*****&cmd.exe /v:on /C "for /L %n in (1,1,5) do @echo !arv:~-%n!"
*
**
***
****
*****
C:\>