Run bash script with "live" output in a Python Script?

Question

I'd like to know if it's possible to run a bash script inside a Python Script and get the bash script output "live" (not after the Python script ran the bash script, I know how to do that).

You'd probably ask me why I want to use a Python Script : actually I'd like build a nice CLI interface and I'm using Inquirer to do that. This interface allows the user to perform task that are actually performed using bash scripts. That's why I'm not using a bash script that executes other scripts.

You will have to use the subprocess.Popen class and capture the output files (stderr and stdout). — Kendas
– Kendas, Commented Sep 16, 2019 at 10:47
So you want to capture the input data from the terminal "live"? — moe asal
– moe asal, Commented Sep 16, 2019 at 11:06
I wanted to capture the script output and print it live, I didn't want to wait until the end of bash script execution. milanbalazs' answer is accurate and solves my problem ! — Propolis
– Propolis, Commented Sep 16, 2019 at 11:59

milanbalazs · Accepted Answer · 2019-09-16 11:05:45Z

6

You can use the following implementation to get the STDOUT of shell script in real-time.

Code:

cmd="whoami"
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, bufsize=1)
for line in iter(p.stdout.readline, b''):
    print(line)
p.stdout.close()
p.wait()

Output:

>>> python3 test.py 
b'milanbalazs\n'

answered Sep 16, 2019 at 11:05

milanbalazs

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Propolis Over a year ago

Thanks, that was exactly what I wanted to do !

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