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I need to: 1. Capture the output of a process in a log file, but 2. Do it detached, since the program can take hours, (or days).

Apparently, if you use QProcess.startDetached(command), you lose your StandardOutput, so that

launchApp = QtCore.QProcess()        
launchApp.setStandardOutputFile("logfile")
launchSim.startDetached("my_command")

does not work.

launchSim.start("my_command")

DOES work, but I can't afford the tie-up. Also 

launchSim.startDetached("my_command", " > logfile")

does not work. It sees "> logfile" as an illegal option to "my_command"

This is on Linux

The problem is that "my_command" dies when the calling program closes. nohup doesn't seem to help. (Not sure why).

Bill the Lizard
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Paul Nelson
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1 Answers1

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How about using os.system() from the standard lib:

import os
os.system("nohup my_command > logfile &")

probably a bit better and safer would be:

import os
os.system("nohup /full/path/to/my_command >& logfile &")

Notice the redirection of both output streams and the full path to command. Also you might be interested to look at os.popen() and the subprocess module.

snies
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