how to send out of ping to /dev/null

Question

I wrote some code to ping the servers but I don't want the output on the screen. But even after sending the output to /dev/null I am getting all the ping details on the screen.

#!/usr/bin/python
import os
import sys
with open(sys.argv[1]) as servers:
    for host in servers:
        response = os.system("ping -q -c 1 "+host+">/dev/null 2>&1")
        if response==0:
            print(host)
        else:
            print(host+"is dead")

ok, thank you , but why here >/dev/null 2>&1 is not working? — Shankar Kumar, Jul 17 '15 at 11:21
http://stackoverflow.com/questions/6735917/redirecting-stdout-to-nothing-in-python — Tanmaya Meher, Jul 17 '15 at 11:23
you will get syntax error first on wiht open statement you havent closed the bracket — Hackaholic, Jul 17 '15 at 11:25
Your code works for me on Ubuntu 14.04. What platform are you on and what python version? — Rodney, Jul 17 '15 at 11:29
This is just a guess but does your particular shell require there to be some space around the ">" character? so ">/dev/null 2>&1" becomes " > /dev/null 2>&1" — Rodney, Jul 17 '15 at 11:34
no , it does not became like that. i tried both way. not sure why it is not working. very strange gor me.. — Shankar Kumar, Jul 17 '15 at 11:46
@Rodney what pyrhon version are you using and how to upgrade or download python 3.3.4 in linux server? : — Shankar Kumar, Jul 17 '15 at 12:56

sinhayash · Answer 1 · 2015-07-17T14:21:51.393

0

Use this:

import subprocess

def myping():
    with open(sys.argv[1]) as servers:
        for host in servers:
            p = subprocess.Popen(["ping", "-q", "-c", "1", host], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
            response = p.wait()
            if response==0:
                print(host+"is dead")
            else:
                print(host+"is up")

myping()

Demo

>>> import subprocess 
>>> host = "google.com"
>>> p = subprocess.Popen(["ping", "-q", "-c", "1", host], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
>>> response = p.wait()
>>> print response
1

edited Jul 17 '15 at 14:21

answered Jul 17 '15 at 11:20

sinhayash

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where should this be written? – Shankar Kumar Jul 17 '15 at 11:23
still not working .. please help. i am testing 100 of servers everyday and my screen get full up... – Shankar Kumar Jul 17 '15 at 11:30
I posted above, try it – sinhayash Jul 17 '15 at 11:55
1

above code does not work for me . it says host dead. even in demo output is 1 which means host is dead. – Shankar Kumar Jul 17 '15 at 12:14
@ShankarKumar it was a silly mistake, code in if else was flipped :D – sinhayash Jul 17 '15 at 14:22
ping requests are getting timed out – sinhayash Jul 17 '15 at 14:34

FunkySayu · Answer 2 · 2015-07-17T11:41:22.260

0

import subprocess
p = subprocess.Popen(["ping", "-q", "-c", "1", host], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
return_code = p.wait()

Avoid using os.system. It is deprecated, and outdated.

edited Jul 17 '15 at 11:41

answered Jul 17 '15 at 11:35

FunkySayu

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how to send out of ping to /dev/null

2 Answers2