How to test if an executable exists in the %PATH% from a windows batch file?

I’m looking for a simple way to test if an executable exists in the PATH environment variable from a Windows batch file.

Usage of external tools not provided by the OS is not allowed. The minimal Windows version required is Windows XP.

Answer

Windows Vista and later versions ship with a program called where.exe that searches for programs in the path. It works like this:

D:\>where notepad
C:\Windows\System32\notepad.exe
C:\Windows\notepad.exe

D:\>where where
C:\Windows\System32\where.exe

For use in a batch file you can use the /q switch, which just sets ERRORLEVEL and doesn’t produce any output.

where /q myapplication
IF ERRORLEVEL 1 (
    ECHO The application is missing. Ensure it is installed and placed in your PATH.
    EXIT /B
) ELSE (
    ECHO Application exists. Let's go!
)

Or a simple (but less readable) shorthand version that prints the message and exits your app:

where /q myapplication || ECHO Cound not find app. && EXIT /B

Attribution
Source : Link , Question Author : sorin , Answer Author : Simon East

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