Running Cygwin on Different Drive etters

Ralph Hempel
Thu Sep 18 18:59:00 GMT 2008

I've got a clean minimal install of Cygwin 1.7 on a USB
stick, and I'd like to be able to use that Cygwin install
no matter what the actual drive letter is that is assigned
to the stick.

So far, I've modified cygwin.bat with this to get the drive
letter of the stick:

   FOR /F %%D in ("%CD%") DO SET CYGDRIVE=%%~dD
   chdir %CYGDRIVE%\cygwin\bin

   bash --login -i

%CYGDRIVE% ends up with the drive letter and colon, which is
useful, but then when we run cygwin.bat... does not quite work - bash complains it cannot create /tmp
because the original drive letter was encoded into a number of
files under /etc, including:


And these files assume that the windows system files are under


So, my question is:

   Would it be possible to allow an environment variable to be part
   of an fstab entry?

Cheers, Ralph

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