我想在Ubuntu 10.04的Python 2.6.5中捕获dpkg --list | grep linux-image
的输出。在Python中从管道捕获的Stdout被截断
from subprocess import Popen
from subprocess import PIPE
p1 = Popen(["dpkg", "--list"], stdout=PIPE)
p2 = Popen(["grep", "linux-image"], stdin=p1.stdout, stdout=PIPE)
stdout = p2.communicate()[0]
标准输出的内容是:
>>> print stdout rc linux-image-2. 2.6.31-14.48 Linux kernel image for version 2.6.31 on x86 ii linux-image-2. 2.6.32-22.36 Linux kernel image for version 2.6.32 on x86 ii linux-image-2. 2.6.32-23.37 Linux kernel image for version 2.6.32 on x86 ii linux-image-2. 2.6.32-24.43 Linux kernel image for version 2.6.32 on x86 ii linux-image-2. 2.6.32-25.44 Linux kernel image for version 2.6.32 on x86 ii linux-image-ge 2.6.32.25.27 Generic Linux kernel image
然而,这是不一样的shell中运行dpkg --list | grep linux-image
:
[email protected]:~$ dpkg --list | grep linux-image rc linux-image-2.6.31-14-generic 2.6.31-14.48 Linux kernel image for version 2.6.31 on x86 ii linux-image-2.6.32-22-generic 2.6.32-22.36 Linux kernel image for version 2.6.32 on x86 ii linux-image-2.6.32-23-generic 2.6.32-23.37 Linux kernel image for version 2.6.32 on x86 ii linux-image-2.6.32-24-generic 2.6.32-24.43 Linux kernel image for version 2.6.32 on x86 ii linux-image-2.6.32-25-generic 2.6.32-25.44 Linux kernel image for version 2.6.32 on x86 ii linux-image-generic 2.6.32.25.27 Generic Linux kernel image
纵观第一线,人们可以看到Python中的输出被截断:
rc linux-image-2. 2.6.31-14.48
代替
rc linux-image-2.6.31-14-generic 2.6.31-14.48
为什么会这样,是有办法让Python中完全相同的输出?
这解决了我的问题。谢谢!这是你必须知道的东西,还是在任何地方都有记录? “man dpkg”根本没有提到LANG。 – cschol 2010-10-03 02:44:15
@cschol:不幸的是,我不知道任何文档;我碰巧在这里了解这个问题:http://ubuntuforums.org/showthread.php?p=6943778#post6943778。 – unutbu 2010-10-03 12:18:27