subprocess output to stdout and to PIPE

Question

I am using the subprocess module like that:

ping = subprocess.Popen(\'fping.exe 192.168.2.3 196.65.58.69\', stdout=PIPE)
output = ping.stdout.readli         


        

Answer 1

There's no such thing as a pipe that goes to two places. Everything written to a pipe will only be read once. (While it's theoretically possible for your program and the console to have access to the same out pipe, if you succeed in doing so then only some of the data will go to your program, and only the data that doesn't will end up on the console.) To get all the output to your program and to the console, someone will have to read and duplicate the data. On a unix-like system, you might use the "tee" command for this, but you probably don't have that on your Windows machine.

So you will have to write the output to the console as you get it.

In this case, you can probably get away with using readline() in a loop instead of readlines().