How to squelch the Cygwin DOS path warning

CygwinIn Cygwin version 1.7 they added a “feature” that would warn you about using DOS-style paths on the command line.

my-cygwin-pc> cd c:/<TAB>cygwin warning:
 MS-DOS style path detected: c:/
 Preferred POSIX equivalent is: /cygdrive/c
 CYGWIN environment variable option "nodosfilewarning" turns off this warning.
 Consult the user's guide for more details about POSIX paths:

At least this only happens the first time during the session, but I still wanted it gone.

So I tried to turn it off, but the instructions were a little ambiguous to me.  I tried setting a nodosfilewarning environment variable in my .cshrc.  I actually tried it several different ways:

setenv nodosfilewarning 1
set nodosfilewarning=1

Turns out none of these are right.  You need to set a Windows environment variable named CYGWIN:


Mystery solved.

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10 Responses to “How to squelch the Cygwin DOS path warning”

  1. Johnson Says:

    Thank you very much for your chapter.My problem solved too.

  2. James Anthony Says:

    I was getting this every time I used a networked map drive.
    Thanks for the tip on turning this feature off!
    Another problem fixed indeed.

  3. Mark Baker Says:

    Thank you for documenting this, and no thank you to Cygwin for such a TERRIBLE error message.

  4. About nodosfilewarning « Smells LIke Rails Says:

    [...] to rails newbies. I was able to fix it by going to two pages. First at Ellery Chan’s Auxiliary Memory blog is the actual fix for Windows. You create a new system variable with the variable name = CYGWIN and [...]

  5. Paul Scoggan Says:

    Thanks for the tip. Worked great.

  6. Aaron Says:

    Thank you for this note!!

  7. David Elson Says:

    O.k., tiny bit more info.

    I set CYGWIN as you have describe above as a windows System environment variable, and that indeed fixed it for cygwin bash stuff … thank you for that ! It’s been a fly in my geek ointment for some time.

    However, the warning still popped up in Apache’s error.log when I did a server side include via exec cgi.

    So, in httpd.conf (or a virtual host def), I put:

    SetEnv CYGWIN nodosfilewarning

    That fixed it for this case as well.

  8. ellery Says:

    Thanks for adding that. If you are running Apache on it, you are doing far more with your Cygwin than I am with mine!

  9. Patrick van Staveren Says:

    Thanks for figuring this out – finally solves the error messages sent by all my cron jobs! Mine was quite bizarre:
    cygwin warning:
    MS-DOS style path detected: /cygdrive/c/Users/Patrick van Staveren/Downloads/
    Preferred POSIX equivalent is: /cygdrive/c/Users/Patrick van Staveren/Downloads/

  10. Martin Says:

    Great, thanks!

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