CODEWITHSUNDEEP
pythonbackgroundpipefork
Michele
Michele

Reputation: 11

Python - Fork a piped command to background and leave it there

I'm new to python, still learning What i need to do is to fork a complex command to background and continue th execution of my main program, something like this: I do this from the linux command line (and works ok)

./pgm1 arg1 arg2 arg3 | ./pgm22 arg21 arg22 arg23 arg24 &

so the program goes to background and i can coninue my work.

How can i run the above command in my python program?

Many thanks

Upvotes: 1

Views: 77

Answers (1)

Padraic Cunningham
Padraic Cunningham

Reputation: 180391

You can PIPE the output of the first command to the second using subprocess.Popen:

from subprocess import PIPE,Popen

p = Popen(["./pgm1" ,"arg1" ,"arg2" ,"arg3" ],stdout=PIPE)
p1 = Popen( ["./pgm22", "arg21", "arg22", "arg23" ,"arg24"],stdin=p.stdout,stdout=PIPE)
p.stdout.close()

Popen does not wait for the command to finish.

Upvotes: 1

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