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.le...@phaseforward.com]
Sent: Sunday, March 07, 2010 2:58 PM
To: cygwin@cygwin.com
Cc: ble...@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
0▒▒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
▒▒\zB▒▒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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