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To remove the leading and trailing spaces from the user input, you can use the `for /f` command to trim the whitespace. Modify the code as follows:

```batch
set /p installoc=
for /f "tokens=* delims=" %%a in ("%installoc%") do set installoc=%%a
set installoc=%installoc:"=%
if NOT EXIST "%installoc%\key.txt" (
echo.
echo."%installoc%" you specified is invalid.
echo.
goto GetPath
)
```

This code uses `for /f` with the `tokens=* delims=` options to trim any leading or trailing spaces from the `installoc` variable.

Searched around, it seems there's no solution in this regard. Asking everyone for help, thanks.

Removing leading spaces can be done in one step with "for /f "tokens=1*"", but I haven't thought of a way to remove trailing spaces without using a loop. Looking forward to a great idea.

Brother wingofsea's line of code in post #1, "set /p installoc=", is Windows CMD Shell code, which is not purely DOS content. So those who often go to "DOS Batch & Script Technology (Batch Room)" to exchange "various script writing and related technologies under the WIN prompt..." didn't notice, fortunately Brother NaturalJ0 noticed that the post you sent is related to Windows CMD Shell batch processing content ~ : )

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DOS Batch & Script Technology (Batch Room)
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(Everyone can discuss issues related to batch processing under DOS, various script writing under DOS and WIN prompts and related technologies here)

Because it's a pure DOS discussion area, so the implementation method of the Windows CMD Shell is posted to:


http://www.cn-dos.net/forum/viewthread.php?tid=25172&sid=mD79Lj

Originally posted by NaturalJ0 at 2006-11-28 08:30:
To remove leading spaces, you can do it in one step with "for /f "tokens=1*"", but I haven't thought of a way to remove trailing spaces in one go without a loop. Looking forward to a great idea.

　　If there are still spaces in the middle of the string, this solution will remove all the spaces encountered the second time.

Create a batch file a.bat

set a=%1 %2 %3 %4 %5 %6 %7 %8 %9

Original batch file:
...
call a i Hate Space But "I don't think so".
echo %a%
rem i Hate Space But "I don't think so".
...
The link on the 5th floor is broken, and I can't even take a look.
If there are people who enter paths like this, there's no need to be too hard on yourself; that's their problem.

Last edited by asdfq on 2020-5-8 at 18:15 ]