Win Batch File - Remove First File Extension

Question

Using rename command in a batch file in Windows is there a clear way for remove the First File Extension from all files in a directory. For example

1.txt.png => 1.png 
2.txt.png => 2.png

Now I use two renaming methods that work. But in my opinion, these methods look "dirty".

1 method. I don't like the 1st method because I exec rename twice.

rename *.txt.png *.
rename *.txt *.png

2 method. I don't like the 2nd method because the number of characters "?" can theoretically be smaller than the basic name (without extension) of the file.

rename *.txt.png ??????????????????????????????.png

? Clear method

I would like to run a command like rename *.txt.png *.png but it doesn't work.

Answer 1

Here is a cmd command that will rename the file as described. When you are confident that the file(s) will be renamed correctly, remove -WhatIf from the Rename-Item command.

If you are using the older Windows PowerShell instead of PowerShell Core, change pwsh to powershell.

pwsh -NoLogo -NoProfile -Command ^
    "Get-Childitem -Filter '*.*.*' |" ^
        "ForEach-Object {" ^
            "if ($_.Name -match '(.*)\..*(\..*)') {" ^
                "Rename-Item -Path $_.FullName -NewName ($($Matches[1])+$($Matches[2])) -WhatIf" ^
            "}" ^
        "}"

Answer 2

@echo off

for %%A in ("*.txt.*") do call :SubRen "%%A"

pause
exit/b

:SubRen
set "Name=%~1"
if /I not "%Name%" == "%Name:.txt.=.%" ECHO ren "%Name%" "%Name:.txt.=.%"
if /I not "%Name%" == "%Name:.txt.=.%" ren "%Name%" "%Name:.txt.=.%"
exit/b