如何通过管道将子进程调用传递给文本文件? [英] How do I pipe a subprocess call to a text file?

问题描述

subprocess.call(["/home/myuser/run.sh", "/tmp/ad_xml",  "/tmp/video_xml"])

现在我有一个可以运行的脚本.当我运行它并碰到这一行时，它开始打印内容，因为 run.sh 中有打印内容.

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.

我也如何通过管道将其传送到文本文件?(如果可能，也打印)

How do I pipe this to a text file also? (And also print, if possible)

推荐答案

如果要将输出写入文件，可以使用 stdout - subprocess.call 的参数.

If you want to write the output to a file you can use the stdout-argument of subprocess.call.

两者都需要

• None(默认，stdout 继承自父级(你的脚本))
• subprocess.PIPE(允许您从一个命令/进程管道到另一个)
• 一个文件对象或一个文件描述符(你想要什么，将输出写入文件)

• None (the default, stdout is inherited from the parent (your script))
• subprocess.PIPE (allows you to pipe from one command/process to another)
• a file object or a file descriptor (what you want, to have the output written to a file)

你需要用open之类的东西打开一个文件，并将对象或文件描述符整数传递给call:

You need to open a file with something like open and pass the object or file descriptor integer to call:

f = open("blah.txt", "w")
subprocess.call(["/home/myuser/run.sh", "/tmp/ad_xml",  "/tmp/video_xml"], stdout=f)

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.

I'm guessing any valid file-like object would work, like a socket (gasp :)), but I've never tried.

正如 marcog 在评论中提到的您可能也想重定向 stderr，您可以将其重定向到同一位置作为带有 stderr=subprocess.STDOUT 的标准输出.上面提到的任何值也都有效，您可以重定向到不同的位置.

As marcog mentions 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.

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