Linux 如何通过管道将子进程调用传递给文本文件？
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How do I pipe a subprocess call to a text file?
提问by TIMEX
subprocess.call(["/home/myuser/run.sh", "/tmp/ad_xml", "/tmp/video_xml"])
RIght now I have a script that I run. When I run it and it hits this line, it starts printing stuff because run.sh has prints in it.
现在我有一个我运行的脚本。当我运行它并到达这一行时，它开始打印内容，因为 run.sh 中有打印内容。
How do I pipe this to a text file also? (And also print, if possible)
我如何将它也通过管道传输到文本文件？（如果可能，还可以打印）
采纳答案by Skurmedel
If you want to write the output to a file you can use the stdout-argument of subprocess.call.
如果你想将输出写入到一个文件，你可以使用标准输出的-argument subprocess.call。
It takes None, subprocess.PIPE, a file object or a file descriptor. The first is the default, stdout is inherited from the parent (your script). The second allows you to pipe from one command/process to another. The third and fourth are what you want, to have the output written to a file.
它需要None, subprocess.PIPE, 一个文件对象或一个文件描述符。第一个是默认值，stdout 继承自父级（您的脚本）。第二个允许您从一个命令/进程管道到另一个。第三个和第四个是您想要的，将输出写入文件。
You need to open a file with something like openand pass the object or file descriptor integer to call:
您需要使用类似的内容打开文件open并将对象或文件描述符整数传递给call：
f = open("blah.txt", "w")
subprocess.call(["/home/myuser/run.sh", "/tmp/ad_xml", "/tmp/video_xml"], stdout=f)
I'm guessing any valid file-like object would work, like a socket (gasp :)), but I've never tried.
我猜任何有效的类似文件的对象都可以工作，比如套接字（喘气:)），但我从未尝试过。
As marcogmentions in the comments you might want to redirect stderr as well, you can redirect this to the same location as stdout with stderr=subprocess.STDOUT. Any of the above mentioned values works as well, you can redirect to different places.
正如marcog在评论中提到的，您可能还想重定向 stderr，您可以将其重定向到与 stdout 相同的位置stderr=subprocess.STDOUT。上面提到的任何值也都有效，您可以重定向到不同的地方。
回答by ocodo
The options for popencan be used in call
的选项popen可用于call
args,
bufsize=0,
executable=None,
stdin=None,
stdout=None,
stderr=None,
preexec_fn=None,
close_fds=False,
shell=False,
cwd=None,
env=None,
universal_newlines=False,
startupinfo=None,
creationflags=0
So...
所以...
subprocess.call(["/home/myuser/run.sh", "/tmp/ad_xml", "/tmp/video_xml"], stdout=myoutput)
Then you can do what you want with myoutput(which would need to be a file btw).
然后你可以做你想做的事myoutput（顺便说一句，这需要是一个文件）。
Also, you can do something closer to a piped output like this.
此外，您可以做一些更接近于像这样的管道输出的事情。
dmesg | grep hda
would be:
将是：
p1 = Popen(["dmesg"], stdout=PIPE)
p2 = Popen(["grep", "hda"], stdin=p1.stdout, stdout=PIPE)
output = p2.communicate()[0]
There's plenty of lovely, useful info on the python manual page.
python 手册页上有很多可爱、有用的信息。
