使用子进程运行多个 bash 命令

running multiple bash commands with subprocess(使用子进程运行多个 bash 命令)

问题描述

如果我运行 echo a;echo b in bash 结果将是两个命令都运行.但是，如果我使用 subprocess 则运行第一个命令，打印出整个行的其余部分.下面的代码回显 a;echo b 而不是 a b，如何让它同时运行这两个命令?

If I run echo a; echo b in bash the result will be that both commands are run. However if I use subprocess then the first command is run, printing out the whole of the rest of the line. The code below echos a; echo b instead of a b, how do I get it to run both commands?

import subprocess, shlex
def subprocess_cmd(command):
    process = subprocess.Popen(shlex.split(command), stdout=subprocess.PIPE)
    proc_stdout = process.communicate()[0].strip() 
    print proc_stdout

subprocess_cmd("echo a; echo b")

推荐答案

你必须在子进程中使用 shell=True 并且没有 shlex.split:

You have to use shell=True in subprocess and no shlex.split:

import subprocess

command = "echo a; echo b"

ret = subprocess.run(command, capture_output=True, shell=True)

# before Python 3.7:
# ret = subprocess.run(command, stdout=subprocess.PIPE, shell=True)

print(ret.stdout.decode())

返回:

a
b

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