如何使用带有管道的`subprocess`命令 [英] How to use `subprocess` command with pipes

问题描述

我想使用 subprocess.check_output() 和 ps -A |grep 'process_name'.我尝试了各种解决方案，但到目前为止没有任何效果.有人可以指导我怎么做吗?

解决方案

要将管道与 subprocess 模块一起使用，您必须传递 shell=True.p>

但是，出于各种原因，这并不是真正可取的，尤其是安全性.相反，分别创建 ps 和 grep 进程，并将输出从一个管道传输到另一个进程，如下所示:

ps = subprocess.Popen(('ps', '-A'), stdout=subprocess.PIPE)输出 = subprocess.check_output(('grep', 'process_name'), stdin=ps.stdout)ps.wait()

但是，在您的特定情况下，简单的解决方案是调用 subprocess.check_output(('ps', '-A')) 然后调用 str.find在输出上.

I want to use subprocess.check_output() with ps -A | grep 'process_name'. I tried various solutions but so far nothing worked. Can someone guide me how to do it?

解决方案

To use a pipe with the subprocess module, you have to pass shell=True.

However, this isn't really advisable for various reasons, not least of which is security. Instead, create the ps and grep processes separately, and pipe the output from one into the other, like so:

ps = subprocess.Popen(('ps', '-A'), stdout=subprocess.PIPE)
output = subprocess.check_output(('grep', 'process_name'), stdin=ps.stdout)
ps.wait()

In your particular case, however, the simple solution is to call subprocess.check_output(('ps', '-A')) and then str.find on the output.

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