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@echo off SET Size=100001000789909099832539 SET Free=9983253910007899090 :stf if %Size:~-1% geq %Free:~-1% ( set/a tx=%Size:~-1%-%Free:~-1% call set tr=%%tx%%%tr% set Size=%Size:~0,-1%&set Free=%Free:~0,-1% if not defined Free goto next goto stf ) set/a tx=1%Size:~-1%-%Free:~-1% call set tr=%%tx:~0,1%%%tr% set Size=%Size:~0,-1%&set Free=%Free:~0,-1% set tq=1%Size:~-9% set/a tq-=1 set Size=%Size:~0,-9%%tq:~1% if defined Free goto stf :next for /f "delims=0 tokens=*" %%i in ("%Size%%tr%") do echo %%i pause