Source code for which.bat

```
@ECHO OFF
```
```
:: Check Windows version
```

IF "%OS%"=="Windows_NT" (SETLOCAL) ELSE (GOTO Syntax)

```
 
```
```
:: Check command line argument
```
```
IF     "%~1"=="" GOTO Syntax
```
```
IF NOT "%~2"=="" GOTO Syntax
```

ECHO.%1 | FIND /V ":" | FIND /V "\" | FIND /V "*" | FIND /V "?" | FIND /V "," | FIND /V ";" | FIND /V "/"  | FIND "%~1" >NUL

```
IF ERRORLEVEL 1 GOTO Syntax
```
```
 
```

:: If the specified command contains a dot, it is not a macro nor an internal command

```
ECHO.%1 | FIND "." >NUL
```
```
IF NOT ERRORLEVEL 1 GOTO ExtCmd
```
```
 
```

:: Check if the command specified is a DOSKEY macro

FOR /F "tokens=1* delims==" %%A IN ('DOSKEY /MACROS 2^>NUL') DO (

```
	IF /I "%~1"=="%%~A" (
```
```
		ECHO.
```
```
		ECHO -DOSKEY Macro-
```
```
		GOTO:EOF
```
```
	)
```
```
)
```
```
 
```

:: Next, check if the command specified is an internal command; to do so

:: reliably we need SysInternals' STRINGS; if it isn't available, we'll

:: just check against a list of known internal commands, risking "false

:: positives" in older CMD versions (e.g. MAKELINK does not exist in XP,

:: but without STRINGS.EXE this batch file will still return "-CMD

:: internal command-"; when STRINGS.EXE IS available, the batch file would

```
:: return "-None-")
```

FOR %%A IN (APPEND ASSOC BREAK CALL CD CHCP CHDIR CLS COLOR COPY DATE DEL DIR DPATH ECHO ENDLOCAL ERASE EXIT FOR FTYPE GOTO IF KEYS MD MKDIR MKLINK MOVE PATH PAUSE POPD PROMPT PUSHD RD REM REN RENAME RMDIR SET SETLOCAL SHIFT START TIME TITLE TRUENAME TYPE VER VERIFY VOL) DO (

```
	IF /I "%~1"=="%%~A" (
```
```
		STRINGS.EXE /? >NUL 2>&1
```
```
		IF ERRORLEVEL 1 (
```

			REM * * * NOT TESTED :: may return a false positive * * *

```
			ECHO.
```
```
			ECHO -CMD Internal Command-
```
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			GOTO:EOF
```
```
		) ELSE (
```

			REM * * * TESTED with STRINGS.EXE :: might still occasionally fail, though * * *

			STRINGS.EXE "%ComSpec%" | FINDSTR.EXE /R /B /I /C:"%~1$" >NUL

```
			IF NOT ERRORLEVEL 1 (
```
```
				ECHO.
```
```
				ECHO -CMD Internal Command-
```
```
				GOTO:EOF
```
```
			)
```
```
		)
```
```
	)
```
```
)
```
```
 
```
```
:ExtCmd
```

:: Search current directory first, then PATH, for the "pure"

:: file name itself or one of the extensions defined in PATHEXT.

:: Add quotes to match directory names with spaces as well.

```
SET Path="%CD%";"%!!%"
```
```
SET Found=-None-
```

:: This command line was partly rewritten by Yakov Azulay.

```
FOR %%A IN (%Path%) DO (
```
```
	ECHO.%~1 | FIND "." >NUL
```
```
	IF ERRORLEVEL 1 (
```
```
		FOR %%B IN (%PathExt%) DO (
```
```
			IF EXIST "%%~A.\%~1%%~B" (
```
```
				CALL :Found "%%~A.\%~1%%~B"
```
```
			)
```
```
		)
```
```
	) ELSE (
```
```
		FOR %%B IN (.;%PathExt%) DO (
```
```
			IF EXIST "%%~A.\%~1%%~B" (
```
```
				CALL :Found "%%~A.\%~1%%~B"
```
```
			)
```
```
		)
```
```
	)
```
```
)
```
```
 
```
```
:: Display the result
```
```
ECHO.
```
```
ECHO.%Found%
```
```
 
```
```
:: Done
```
```
GOTO End
```
```
 
```
```
 
```
```
:Found
```
```
:: Stop after finding the first match
```
```
IF NOT "%Found%"=="-None-" GOTO:EOF
```
```
:: Store the first match found
```
```
SET Found=%~f1
```
```
GOTO:EOF
```
```
 
```
```
 
```
```
:Syntax
```
```
ECHO.
```
```
ECHO WHICH, Version 5.20
```

ECHO UNIX-like WHICH utility for Windows 2000 and later

```
ECHO.
```
```
ECHO Usage:  WHICH  program_name
```
```
ECHO.
```

ECHO Notes:  You may specify the program_name with or without extension, but

ECHO         wildcards, drive, or path are NOT allowed.

ECHO         This batch file first searches the list of DOSKEY macros, then

ECHO         the list of CMD's internal commands, then the current directory,

ECHO         and finally the PATH for the command specified.

ECHO         If SysInternals' STRINGS is available and in the PATH, CMD's internal

```
ECHO         commands will be verified.
```

ECHO         If STRINGS is NOT available, internal commands are NOT verified, e.g.

ECHO         even though MKLINK is not available in XP at all, the command

ECHO         "WHICH MKLINK" would still return "-CMD internal command-" anyway.

```
ECHO.
```

ECHO Written by Yakov Azulay and Rob van der Woude

```
ECHO http://www.robvanderwoude.com
```
```
 
```
```
:End
```
```
IF "%OS%"=="Windows_NT" ENDLOCAL
```
```
 
```