[Mingw-users] Re: msys.bat question

[Greg M. <la...@ms...>]

On Mon, 29 Mar 2004, Benjamin Riefenstahl wrote:

> > So, %0\.. equals .\ ?

I just realized it is a correspondent to the Unix positional parameter, $0.

> It means "pretend you had a directory '%0' and than you go up one
> level".  It makes more sense in a batch files where "%0" is replaced
> with the batch file name itself as called on the command line, so
> "%0\.."  can expand to "c:\some-directory\mybatch.bat\.." which is
> interpreted as "c:\some-directory".  The trick is that Windows doesn't
> first checking that there is a directory
> "c:\some-directory\mybatch.bat" before resolving the ".." part.

Although that directory would have to exist for the script to be executed.

> The snag is - I had forgot to mention it before, because I had
> forgotten myself - you actually have to call that batch as
> "c:\some-directory\mybatch param param".  I.e. while "%~dp0" will
> calculate the path of the batch file for you, even when
> "c:\some-directory" is in your PATH and when you just say "mybatch
> param param", OTOH the syntax "%0\.." doesn't do that, so for a call
> through the PATH it will not work, because "mybatch\.." *is* indeed
> actually just a complicated way of saying ".".




	C:\s\home\greg>earnie.bat
	Bad command or file name

	C:\s\home\greg>move c:\s\bin\earnie.bat c:\windows\
	C:\S\BIN\earnie.bat => C:\WINDOWS\earnie.bat [ok]

	earnie.bat is

	if EXIST %0\..\..\..\bin\sh.exe echo 1
	/c/windows/earnie.bat (END) 

	C:\s\home\greg>earnie.bat

	C:\s\home\greg>if EXIST earnie.bat\..\..\..\bin\sh.exe echo 1

	1


	C:\s\home\greg>cd ..\..

	C:\s>earnie.bat

	C:\s>if EXIST earnie.bat\..\..\..\bin\sh.exe echo 1


	C:\s>move c:\windows\earnie.bat c:\s\bin\
	C:\WINDOWS\earnie.bat => C:\S\BIN\earnie.bat [ok]

	C:\s>c:\s\bin\earnie.bat

	C:\s>if EXIST c:\s\bin\earnie.bat\..\..\..\bin\sh.exe echo 1


	C:\s>

I think I see.

-- 
Greg Matheson, Taiwan