redirect-append (>>) creates garbage-y file

[Thomas Wolff]

On 09.03.2010 20:41, William Lebow wrote:
> I've diagnosed this problem further. It is an interaction between cygwin and a security package called "Credant Guardian Shield" that my company installs on all of its laptops. I can't say specifically that it is a cygwin bug, but this bad behavior is not present in earlier versions.
>
> As described below, the problem is a command like "echo foo>>  foo.txt" creates a file that starts with a bunch of garbage, and ends with the expected text.
>    
It would be interesting to check whether it only occurs if you append to 
a file from the command line or also if an application opens a file in 
append mode,
in which case the issue would be much more critical I think.
In any case, I would also submit a bug report to that security package.
------
Thomas
>   -- Bill
>
>
>
> -----Original Message-----
> From: William Lebow [mailto:William.Lebow@phaseforward.com]
> Sent: Sunday, March 07, 2010 2:58 PM
> To: cygwin@cygwin.com
> Cc: blebow@alum.mit.edu
> Subject: redirect-append (>>) creates garbage-y file
>
> I'm a long time cygwin user, but I am having the weirdest problem after installing on my new Dell laptop running Windows XP professional. I'd be grateful for any advice or hints from this group.
>
> I am doing a simple redirect-append (>>, that is) to create a new file. When I do this the new file has twice as many characters as I expect and the first bunch of characters are seemingly garbage.
>
> This only happens with ">>" and only if I am creating a new file.
> Using ">>" to append to a file is no problem.
> Using ">" to create a new file is not problem
>
> So far this has not been reproducable on any other PC.
>
> I am using the bash version 3.2.49(23)-release (i686-pc-wygwin) , with the 1007.1.0.0 cygwin1 dll-- see attached output from cygcheck.
>
> Some examples follow::
>
> #################################
> #### Example 1
> #### I expect 4 characters (including the terminator); I get 7 #### The first 3 characters are unwanted
>    $ echo abc>>  test1.txt
>    $ wc test1.txt
>    1 1 7 test1.txt
>    $ cat test1.txt
>    0б▒б▒abc
>
> $ hexedit test1.txt
> 00000000   30 B5 A2 61  62 63 0A                                            0..abc.
>
> #################################
> #### Example 2
> #### I expect 8 characters (including the terminator); I get 15 #### The first 7 characters are unwanted
>    $ echo abcdefg>>  test2.txt
>    $ wc test2.txt
>     1  1 15 test2.txt
>    $ cat test2.txt
>    б▒б▒\zBб▒б▒abcdefg
>
> hexedit test2.txt
> 00000000   AD EB 5C 7A  42 B6 C5 61  62 63 64 65  66 67 0A                  ..\zB..abcdefg.
>
>
> #################################
> #### Example 3
> #### Use>  instead of>>  and I get exactly what I should get
>    $ echo abc>  test3.txt
>    $ wc test3.txt
>    1 1 4 test3.txt
>    $ cat test3.txt
>    abc
>
>
>
> Many thanks for any help
>
>   -- Bill
>
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