I have 2 python scripts, foo.py and bar.py. I am running foo.py in the background using
python foo.py & Now I want to run bar.py and use the stdout from this file to trigger script inside foo.py. Is this possible? I'm using Ubuntu 16.04 LTS.
You could use UNIX named pipe for that.
First, you create named pipe object by executing mkfifo named_pipe in the same directory, where you have your python files.
Your foo.py then could look like this:
while True: for line in open('named_pipe'): print 'Got: [' + line.rstrip('\n') + ']' And your bar.py could look like this:
import sys print >>open('named_pipe', 'wt'), sys.argv[-1] So, you run your consumer process like this: python foo.py &. And finally, each time you execute python bar.py Hello, you will see the message Got: [Hello] in your console.
UPD: unlike Paul's answer, if you use named pipe, you don't have to start one of the processes from inside the other.
There is a system that actually comes from UNIX world that creates pipes between processes. A pipe is basically a pair of file descriptors, each program having access to one of them. One program writes to the pipe, while the other reads:
https://docs.python.org/2/library/subprocess.html
However, this requires an aditional script where you start foo and bar as subprocesses and connect their outputs/inputs.
