windows - 用 bat 更改 PATH 变量？

Question

我正在尝试编写 2 个 BATCH 工具来改变我的系统变量路径。第一个应该在 Path 前面添加一个目的地，但之前将旧路径保存在 txt 文件中，第二个 BATCH 文件应该从 txt 文件加载路径并将路径替换为保存的路径以再次恢复旧路径.

@echo. 2>%date:~0%_PATH.txt
@echo %PATH% >> %date:~0%_PATH.txt
@echo "This tool will change the system variable PATH"
@echo "if you want to continue, press any key."
@echo "To cancel press CTRL+C"
@pause

@setx /m PATH  "C:\MinGW\bin;%PATH%"
@echo.
@echo.
@echo "The System variables has been set"
@echo "Your original PATH variable was saved to: %date:~0%_PATH.txt"

@pause

这是第一个批处理文件，应该在 PATH 前面添加 C:\MinGW\bin。 (这不是重点，在我运行批处理文件后，不仅仅是我的目标。

@ECHO OFF
ECHO "You are about to restore your system variable PATH to a previous state!"
ECHO "If you want to preform this step, press any key."
ECHO "To cancel the process, press CTRL+C";
ECHO.
SET index=1

SETLOCAL ENABLEDELAYEDEXPANSION
FOR %%f IN (*.*) DO (
   SET file!index!=%%f
   ECHO !index! - %%f
   SET /A index=!index!+1
)

SETLOCAL DISABLEDELAYEDEXPANSION

SET /p selection="Please select by typing the number which file you want to recover      your PATH:"

SET file%selection% > nul 2>&1

IF ERRORLEVEL 1 (
   ECHO Invalid number selected!!  
   EXIT /B 1
)

CALL :RESOLVE %%file%selection%%%
ECHO Selected file name: %file_name%

GOTO :EOF

:RESOLVE
SET file_name=%1
GOTO :EOF

@setx /m PATH %file_name%

这是恢复批处理文件，不会选择我选择的文件。

我希望有人能帮助我。谢谢

Answer 1

SETX 只改变注册表中的值，不改变当前shell环境中的变量。正如文档在您运行 SETX/? 时所说:

NOTE: 1) SETX writes variables to the master environment in the registry.
      2) On a local system, variables created or modified by this tool
         will be available in future command windows but not in the
         current CMD.exe command window.

如果您只想在当前环境中修改 PATH 的值，只需使用常规的 SET 命令即可。如果您想同时执行这两项操作，则需要同时使用这两个命令。