Need a space blank after each of 2 lines using batch script from .txt file

Question

I need help in to provide output that contain a blank space after each of 2 lines from .txt file containing number of lines without any blank in between.

Example :

Suppose a .txt file name as media.txt contains below input

A
B
C
D
.
.
.
Z

I want to represent above input into output like :

A
B
-----
C
D
----
E
F
----
.
.
.
.

I tried by using odd even concept but failing them to represent in above mentioned output.

Here, is my code in batch script:

set flag=1
for /f "tokens=2 delims==" %%a in ('type media.txt^|findstr "output"') do (
  if %flag%%%2==0 (
    echo %%a
  ) else (
    echo.
    echo ------------------
    echo %%a
    set flag+=1    
  )
)

Please let me know, where i am doing wrong..

Answer 1

This can easily be done in a batch-file or cmd with PowerShell. If you are on a supported Windows system, PowerShell will be available.

powershell -NoLogo -NoProfile -Command ^
  "Get-Content .\media.txt -ReadCount 2 | ForEach-Object { $_; Write-Output '----' }"