Real-time reading of terminal output from server

问题

I'm trying to process images from my camera on my server and get the information after processing on my local machine in real-time. I can get necessary information as terminal outputs on my server, but I can't put this info in my python code on local machine, until my server program is running. I'm tried this code:

cmd="sshpass -p 'pass' ssh -Y user@ip -t 'process_image; bash -l'"
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, bufsize=1)
for line in iter(p.stdout.readline, b''):
    print(line)
    p.stdout.close()
    p.wait()

But it doesn't work - it looks like this code just paused my program. I tried to write output to file and than read file from local machine, but it distorts my data. What can i do to read terminal output from server in real-time?

回答1:

Since the output is going to be line buffered since you use bufsize=1, then you could just do:

cmd="sshpass -p 'pass' ssh -Y user@ip -t 'process_image; bash -l'"
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, bufsize=1)
for line in p.stdout:
    print(line)
    .....

Of course, this assumes your command is giving you the output you expect.

来源：https://stackoverflow.com/questions/41908888/real-time-reading-of-terminal-output-from-server