Nohup is not writing log to output file

python nohup
user1642513 picture user1642513 · Oct 16, 2012 · Viewed 76.6k times · Source

I am using the following command to run a python script in the background:

nohup ./cmd.py > cmd.log &

But it appears that nohup is not writing anything to the log file. cmd.log is created but is always empty. In the python script, I am using sys.stdout.write instead of print to print to standard output. Am I doing anything wrong?

Answer

vz0 picture vz0 · Oct 16, 2012

You can run Python with the -u flag to avoid output buffering:

nohup python -u ./cmd.py > cmd.log &

Related questions

Run a program from python, and have it continue to run after the script is killed

I've tried running things like this: subprocess.Popen(['nohup', 'my_command'], stdout=open('/dev/null', 'w'), stderr=open('logfile.log', 'a')) This works if the parent script exits gracefully, but if I kill the script (Ctrl-C), all my child …

Read More
How to constantly run Python script in the background on Windows?

I have created a script that moves files from one folder to another. But since the original folder is the Downloads folder I need it to always run in the background. I also have a standard Batch file that looks …

Read More
Unable to start service with nohup due to 'INFO spawnerr: unknown error making dispatchers for 'app_name': EACCES'

I'm trying to start a service with supervisor, but I get an error saying INFO spawnerr: unknown error making dispatchers for 'app_name': EACCES Here's my supervisord.conf file: [supervisord] logfile=/tmp/supervisord.log logfile_maxbytes=50MB ; change these depending …

Read More