用sort的时候遇到一个非常奇怪的问题

flyd1005

[li@localhost ~]$ cat x.txt
-a
d
-d
[li@localhost ~]$ sort x.txt
-a
d
-d
[li@localhost ~]$ hexdump x.txt
0000000 612d 640a 2d0a 0a64                    
0000008

flyd1005

$ sort --version
sort (GNU coreutils) 7.6
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

在多台Linux机器上都是这样的，不能理解啊，是sort的bug吗？

Shell_HAT

什么系统？

#sort urfile -a -d d #uname -a Linux ubuntu 2.6.24-22-generic #1 SMP Mon Nov 24 19:35:06 UTC 2008 x86_64 GNU/Linux #sort --version sort (GNU coreutils) 6.10 Copyright (C) 2008 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Written by Mike Haertel and Paul Eggert.

flyd1005

[xxxxx@localhost ~]$ uname -a
Linux localhost.localdomain 2.6.32.9-70.fc12.i686.PAE #1 SMP Wed Mar 3 04:57:21 UTC 2010 i686 i686 i386 GNU/Linux
[xxxxx@localhost ~]$ sort --version
sort (GNU coreutils) 7.6
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Mike Haertel and Paul Eggert.

flyd1005

coreutils-8.5已经release，应该没有这个问题吧？我要抽空看看。

不知道是不是下面这个bug?
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=6327