How to call combined linux commands on python subprocess

Question

I write this command on linux

netstat -ant | wc -l

but when I try to call from python with

subprocess.Popen(['netstat','-ant','|','wc','-l'])

I cant get all output, I see just result of first command (netstat -ant). How can I process this command on python ? (note: this command gives a int as a result)

Why do you need `grep` and `wc` external programs anyway? Its not that difficult to do these operations in Python. — cdarke, Feb 27 '17 at 10:36
Maybe this previous [question](http://stackoverflow.com/questions/295459/how-do-i-use-subprocess-popen-to-connect-multiple-processes-by-pipes) can help you. — Juan Antonio, Feb 27 '17 at 10:41

score 0 · Accepted Answer · answered Feb 27 '17 at 10:48

0

I don't know if there's any easier method but you can go like:

from subprocess import run, Popen, PIPE
sess1 = run(['netstat', 'ant'], stdout=PIPE)
sess2 = Popen(['grep', '"SYN"'], stdin=PIPE)
sess2.stdin.write(sess1.stdout)
sess2.communicate() # required?

answered Feb 27 '17 at 10:48

Piotr Kamoda

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thanks, I found a solution like this – pala9323 Feb 27 '17 at 10:58

How to call combined linux commands on python subprocess

1 Answers1