奇怪的子进程行为

Question

subprocess.call(["find", ".", "-exec", "sh", "-c", "echo testFirst", ";"])
subprocess.call(["find", ".", "-exec", "sh", "-c", "echo testSecond", ";"], shell=True)
subprocess.call(["find . -exec sh -c 'echo testThird' \\;"], shell=True)

subprocess.call(["find", ".", "-exec", "sh", "-c", "touch testFirst", ";"])
subprocess.call(["find", ".", "-exec", "sh", "-c", "touch testSecond", ";"], shell=True)
subprocess.call(["find . -exec sh -c 'touch testThird' \\;"], shell=True)

以下输出：

testFirst
testFirst
testFirst
.
./test.py
./data
testThird
testThird
testThird
.
./test.py
./testFirst
./data

并且只创建testFirst 和testThird 文件。

行为的解释是什么？

我假设输出为testFirst、testSecond、testThird 以及正在创建的三个文件。

Answer 1

https://stackoverflow.com/a/10661488/1663462

当你传递 shell=True 时，Popen 需要一个字符串参数，而不是 一个列表。

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