CODEWITHSUNDEEP
pythonpython-3.xlinuxstdout
user2023
user2023

Reputation: 478

Writing stdout into a file while executing it on the remote host

I'm writing a python script capturing FQDN from within the remote host's itself just for some sanity checks, below is the small code I'm trying to run and want to capture the stdoutout of the same into my current host from i'm running it but rather its creating files into the remote hosts, and not the one from where I'm running.

#!/usr/bin/python3
system_name = socket.gethostname()
f = open("output.txt", "a")
print("Hostname: {}".format(system_name, file=f)
f.close()

OR 

#!/usr/bin/python3
system_name = socket.gethostname()
sys.stdout=open("output.txt","a")
print("Hostname: {}".format(system_name)
sys.stdout.close()

Even i tried adopting like but that didn't worked though.

name = 'mycurrenthost'
system_name = socket.gethostname()
short_sysname = socket.gethostname().split('.', 1)[0]

if short_sysname == name:
  f = open("output.txt", "a")
  print("Hostname: {}".format(system_name), file=f)
  f.close()

My example myhostlist looks like..

mydbhost1
mydbhost2
mydnhost3
mydbhost4

Below id how I'm executing the above code..

$ for host in `cat myhostlist`;do timeout -t 20 ssh -o "StrictHostKeyChecking no" "$host" "python -s" < ./myPythonScript.py;done

My output on the current console while not writing to a file...

Hostname: mydbhost1.example.com
Hostname: mydbhost2.example.com:
Hostname: mydnhost3.example.com:
Hostname: mydbhost4.example.com:

please help

Upvotes: 0

Views: 426

Answers (1)

MatsLindh
MatsLindh

Reputation: 52892

You're running the python application on the remote host; what do you expect it to do? It runs on the remote host, it writes to files on the remote host - it can't write to files locally -it does not have access to the file system from where you initiate the ssh session.

Instead you can print out the result to stdout with just print, and then capture the standard output locally in the shell with >> output.txt after the command (>> means that the output will be appended to output.txt).

Upvotes: 1

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