如何存储在Python中的变量的执行shell命令的结果？ [英] How to store the result of an executed shell command in a variable in python?

问题描述

我需要存储，我在一个变量执行的shell命令的结果。但我couldn得到。我想这样的：

I need to store the result of a shell command that I executed in a variable. But i couldn get that. I tried like:

call=os.system("cat syscall_list.txt | grep f89e7000 | awk '{print $2}'")
print call

但它打印在终端的结果并打印通话的价值为零，这可能表明是成功。如何获得存储在一个变量的结果？

But it prints the result in terminal and prints the value of call as zero, possibly indicating as success. How to get the result stored in a variable?

推荐答案

使用 子 模块来代替：

Use the subprocess module instead:

import subprocess
output = subprocess.check_output("cat syscall_list.txt | grep f89e7000 | awk '{print $2}'", shell=True)

编辑：这是新的Python 2.7。在早期版本中这应该工作（与改写如下图所示的命令）：

this is new in Python 2.7. In earlier versions this should work (with the command rewritten as shown below):

import subprocess
output = subprocess.Popen(['awk', '/f89e7000/ {print $2}', 'syscall_list.txt'], stdout=subprocess.PIPE).communicate()[0]

---

作为一个方面说明，你可以重写

---

As a side note, you can rewrite

cat syscall_list.txt | grep f89e7000

要

grep f89e7000 syscall_list.txt

和你甚至可以用一个 AWK 脚本替换整个语句：

And you can even replace the entire statement with a single awk script:

awk '/f89e7000/ {print $2}' syscall_list.txt

通往：

import subprocess
output = subprocess.check_output(['awk', '/f89e7000/ {print $2}', 'syscall_list.txt'])

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