subprocess.Popen shell=True to shell=False [英] subprocess.Popen shell=True to shell=False

问题描述

我知道对子进程使用 shell=True 是不好的做法.但是对于这行代码，我不确定如何使用 shell=False 执行它

I know that it is bad practice to use shell=True for subprocesses. However for this line of code, I'm not sure how to execute it with shell=False

subprocess.Popen('candump -tA can0 can1 >> %s' %(file_name), shell=True)

我想运行的命令在哪里:

Where the command I want to run is:

candump -tA can0 can1 >> file_name

其中 file_name 是 /path/to/file.log

推荐答案

你不能像使用 shell=True 那样直接在命令中使用管道，但它很容易适应:

You can't directly use piping in the command the way you do with shell=True, but it's easy to adapt:

with open(file_name, 'ab') as outf:
    proc = subprocess.Popen(['candump', '-tA', 'can0', 'can1'], stdout=outf)

这会在 Python 级别打开文件进行二进制追加，并将其作为子进程的 stdout 传递.

That opens the file at the Python level for binary append, and passes it as the stdout for the subprocess.

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