Continuing the loop

Question

Ok so I have code that is supposed to run through a txt file and ping the Ip's if the ping is equal to 0 its does an 'nslookup' on it and then it's supposed to continue but after it does the first one in the terminal it's left on a > as if waiting for input. In other instances, my code runs through the txt file fine but once I added in the 'nslookup' it stops after the first one and waits for input.

Is there a way to make it continue to cycle through the txt file till it gets to the end?

Heres the code I'm using I know there are other ways to do a look up on an Ip address but I'm trying to use 'nslookup' in this case unless its impossible.

import os
with open('test.txt','r') as f:
  for line in f:
         response = os.system("ping -c 1 " + line)
         if response == 0:
                 print os.system('nslookup')
         else:
                 print(line, "is down!")

Answer 1

that's simply because you forgot to pass the argument to nslookup

When you don't pass any argument, the program starts in interactive mode with its own shell.

L:\so>nslookup
Default server :   mydomain.server.com
Address:  128.1.34.82

> 

But using os.system won't make you able to get the output of the command. For that you would need

output = subprocess.check_output(['nslookup',line.strip()])
print(output) # or do something else with it

instead of your os.system command