46 popen() gives you control over the process's input or output file streams. system() doesn't. If you don't need to access the process's I/O, you can use system() for simplicity. system() is in C89 and C99; popen() is Posix only (though the Windows API also has one).
I am having trouble with finding out how to use popen() to grab stdout from child programs in Linux to a main C++ program. I was looking around and found this snippet of code that does what I want ...
The Posix function I found is popen, but I failed to write a working sample code. Please help me get this work. <edit1> Do I have to use dup? I can see some examples found with Google using it. But the Linux manual of dup really does not help me understanding how to use that. </edit1> a.c c Copy
I'm trying to make a system call in Python and store the output to a string that I can manipulate in the Python program. #!/usr/bin/python import subprocess p2 = subprocess.Popen("ntpq -p") I've t...
from subprocess import Popen, PIPE def log_command_outputs(commands): processes = [Popen(cmd, stdout=PIPE) for cmd in commands] outputs = [proc.communicate()[0].split() for proc in processes] for output in outputs: for line in output: script_log.write(line) script_long.write("\n") This starts the commands in parallel, which might make it a little faster than doing them one by one (but probably ...
In my old python script, I use the following code to show the result for Windows cmd command: print (os.popen ("dir c:\\").read ()) As the python 2.7 document said os.popen is obsolete and subprocess...
As a further corollary, on modern Python you want to avoid Popen whenever you can; with subprocess.check_call this is a one-liner which doesn't require the communicate() song and dance.
