windows – 检查命令是否在CMD内部

@ECHO off

CALL :isInternalCommand dir dirInternal
ECHO is dir internal: %dirInternal%

CALL :isInternalCommand find findInternal
ECHO is find internal: %findInternal%

exit /b 0

:isInternalCommand
SETLOCAL

MKDIR %TEMP%EMPTY_DIR_FOR_TEST > NUL 2>& 1
CD /D %TEMP%EMPTY_DIR_FOR_TEST
SET PATH=
%~1 /? > NUL 2>&1
IF ERRORLEVEL 9009 (ENDLOCAL
SET "%~2=no"
) ELSE (ENDLOCAL
SET "%~2=yes"
)

GOTO :EOF

旧解决方案

你可以在哪里使用.如果失败,该命令可能是内部的.如果成功,您将获得证明它不是内部的可执行路径.

C:Usersuser>where path
INFO: Could not find files for the given pattern(s).

C:Usersuser>where find
C:WindowsSystem32find.exe

编辑：正如评论所示,如果您正在寻找便携性而不仅仅是研究,这可能不是最好的解决方案.所以这是另一种可能的解决方案.

将％PATH％设置为空,以便HELP找不到任何内容,然后对您要检查的命令运行HELP.

C:Usersuser>set PATH=

C:Usersuser>path
PATH=(null)

C:Usersuser>%WINDIR%System32help del
Deletes one or more files.

DEL [/P] [/F] [/S] [/Q] [/A[[:]attributes]] names
[...]

C:Usersuser>%WINDIR%System32help find
'find' is not recognized as an internal or external command,operable program or batch file.

如果命令没有帮助,这可能仍会失败.

编辑2：没关系,这也行不通.两种情况都返回％ERRORLEVEL％= 1.