I am calling different processes with the subprocess module. However, I have a question. In the following codes: callProcess = subprocess.Popen([‘ls’, ‘-l’], shell=True) and callProcess = subprocess.Popen([‘ls’, ‘-l’]) # without shell Both work. After reading the docs, I came to know that shell=True means executing the code through the shell. So that means in absence, … Read more
Here’s the Python code to run an arbitrary command returning its stdout data, or raise an exception on non-zero exit codes: proc = subprocess.Popen( cmd, stderr=subprocess.STDOUT, # Merge stdout and stderr stdout=subprocess.PIPE, shell=True) communicate is used to wait for the process to exit: stdoutdata, stderrdata = proc.communicate() The subprocess module does not support timeout–ability to … Read more
I believe that running an external command with a slightly modified environment is a very common case. That’s how I tend to do it: import subprocess, os my_env = os.environ my_env[“PATH”] = “/usr/sbin:/sbin:” + my_env[“PATH”] subprocess.Popen(my_command, env=my_env) I’ve got a gut feeling that there’s a better way; does it look alright? 8 Answers 8
This question already has answers here: Running shell command and capturing the output (21 answers) Closed 7 months ago. 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 tried a few things … Read more
I’m launching a subprocess with the following command: p = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True) However, when I try to kill using: p.terminate() or p.kill() The command keeps running in the background, so I was wondering how can I actually terminate the process. Note that when I run the command with: p = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE) It does … Read more
I’m using the subprocess module to start a subprocess and connect to its output stream (standard output). I want to be able to execute non-blocking reads on its standard output. Is there a way to make .readline non-blocking or to check if there is data on the stream before I invoke .readline? I’d like this … Read more
I want to write a function that will execute a shell command and return its output as a string, no matter, is it an error or success message. I just want to get the same result that I would have gotten with the command line. What would be a code example that would do such … Read more
How do I call an external command within Python as if I’d typed it in a shell or command prompt? 6 63 Use the subprocess module in the standard library: import subprocess subprocess.run([“ls”, “-l”]) The advantage of subprocess.run over os.system is that it is more flexible (you can get the stdout, stderr, the “real” status … Read more
