Batch knowing its invoker: cmd.exe or powershell? - powershell

Question

I wonder how to check if a batch file is executed by cmd.exe or instead by powershell
I discovered that the ENV variable %CmdCmdLine%is set to something in cmd.exe and should not be set inside a powershell shell.
But if I run a batch file in powershell it temporary assumes a value like C:\WINDOWS\system32\cmd.exe /c ""C:\path\to\check-interpreter.bat""
Given also the inability of batch to check IF PATTERN I cannot find a way to let my batch file be able to know which command interpreter is running.
In the below code I tried to use findstr /R to check cmd at the start of the line. Infact inside cmd.exe the line should start with cmd.exe ... while in powershell should start with the full path C:\WINDOWS\system32\cmd.exe /c ...
Here my attempt:
#ECHO OFF
FOR /F "tokens=* USEBACKQ" %%F IN (`echo %CmdCmdLine% ^^^| findstr /R
"^cmd"`) DO (
SET var=%%F
)
ECHO var set to: %var%
REM IF [%var%]==[] ECHO var set to: %var%
IF DEFINED var (
ECHO CmdCmdLine founnd!
ECHO VAR : %var%
ECHO COMMANDLINE: %CmdCmdLine%
) ELSE (
ECHO CmdCmdLine NOT found..
)
The problem in the above code is that var is not populated at all:
# cmd.exe
C:\path\to>.\check-interpreter.bat
CmdCmdLine founnd!
COMMANDLINE: "C:\WINDOWS\system32\cmd.exe"
# powershell
PS C:\path\to> .\check-interpreter.bat
CmdCmdLine founnd!
COMMANDLINE: C:\WINDOWS\system32\cmd.exe /c ""C:\path\to\check-
interpreter.bat""