@echo off&setlocal enabledelayedexpansion
for /l %%a in (1000,1,9999) do set "_!random!_%%a=%%a"
for /f "tokens=2 delims==" %%a in ('set _') do (
     set /a n+=1
     if !n! leq 100 echo %%a
)
pause>nul
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@echo off
setlocal enabledelayedexpansion
for /l %%i in (1 1 10) do (
      set /a num%%i=!random!%%90+10
      set str=num1
)
for /l %%i in (2 1 10) do (
if not !str!==!num%%i! (
echo !num%%i!
))
pause
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@echo off&setlocal enabledelayedexpansion
for /l %%a in (1000,1,9999) do (
    if not defined _%%a set /a _%%a=%%a
    set /a a=!random!%%9000+1000
    if not defined _!a! set /a _!a!=!a!
    set /a _!a!=%%a,_%%a=a
)
for /l %%a in (1000,1,1099) do echo !_%%a!
pause>nul
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