[英]How to run awk -F\' '{print $2}' inside subprocess.Popen in Python?
I need to run a shell command inside subprocess.Popen in Python. 我需要在Python中的subprocess.Popen中运行一个shell命令。
The command is: $ virsh dumpxml server1 | 命令是:$ virsh dumpxml server1 | grep 'source file' | grep'源文件'| awk -F\\' '{print $2}' awk -F \\''{print $ 2}'
The output is: /vms/onion.qcow2 输出为:/vms/onion.qcow2
I'm having two challenges with the above command: 我对上面的命令有两个挑战:
1) The command is inside a loop, and where you see 'server1', it is a variable that will have a server name. 1)命令在一个循环中,你看到'server1',它是一个具有服务器名称的变量。
2) Python is complaining about KeyError: 'print $2' 2)Python抱怨KeyError:'print $ 2'
Here is what I have so far: 这是我到目前为止:
proc = subprocess.Popen(["virsh dumpxml {0} | grep 'source file' | awk -F\' '{print $2}'".format(vm)], stdout=subprocess.PIPE, shell=True)
stdout = proc.communicate()[0]
Thanks in advance. 提前致谢。
While it's possible use libvirt directly from python, your problem is that {
is the format string, and surrounds print $2
in your awk
script as well, so you have to escape those braces like 虽然可以直接从python使用libvirt,但你的问题是{
是格式字符串,并且在你的awk
脚本中包围print $2
,所以你必须逃避那些大括号
proc = subprocess.Popen(["virsh dumpxml {0} | grep 'source file' | awk -F\\' '{{print $2}}'".format(vm)], stdout=subprocess.PIPE, shell=True)
stdout = proc.communicate()[0]
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