CODE:  [Copy to clipboard]

---

@echo off
for /f "tokens=2 delims=:" %%a in ('find /c /v "" "abc.txt"') do set /a n=%random%%%%%a+1"
findstr /n .* abc.txt|findstr /b "%n%:"
pause>nul

CODE:  [Copy to clipboard]

---

@echo off
for /f %%a in (abc.txt) do set /a n+=1
set /a line=%random%%%%n%
for /f "delims=" %%b in ('more +%line% abc.txt') do echo %%b & goto out
:out
pause