Execute python from bash and see its log on terminal

Question

I have the following:

main.py python script which while running writes to main.log.

I am writing a sh file.

I want to execute the python script from sh file and to see in the terminal window all the log which is written to the main.log file while executing.

Currently I am doing it by open a terminal and execute the script and open another terminal and writing

tail -f main.log.

Thanks.

Simply use & after the command you use for launching your python script to launch it as a background process. Then, you can tail -f in the same terminal. — DainDwarf
– DainDwarf, Commented Feb 4, 2016 at 12:45
could you change your script to log to stdout instead? You can redirect the output to terminal and a file later if necessary: python main.py | tee main.log. — jfs
– jfs, Commented Feb 4, 2016 at 15:41

DainDwarf · Accepted Answer · 2016-02-04 15:52:34Z

1

Simply use & after the command you use for launching your python script to launch it as a background process. Then, you can tail -f in the same terminal.

answered Feb 4, 2016 at 15:52

DainDwarf

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2 Comments

user1902346 Over a year ago

I still have a problem where I make the "sudo python3 ... & sudo tail -f Main.log", it does the work and shows me the log to the terminal. The thing is that after this command, I have to run another command in the continue of the script, but the tail -f runs without ending and the next command in the script doesn't get executed. How can I solve it ? Thanks.

DainDwarf Over a year ago

You probably should read some bash scripting tutorial past this point.

clipsett · Accepted Answer · 2016-02-04 16:03:19Z

I've used the nohup command in the past to essentially disconnect from a process and let it run in the background. The syntax would be something along the lines of nohup <program execution and options> > main.log &

Then you can tail -f main.log to watch it update in real time.

I've had issues with nohup where a .sh either runs infinitely or has a syntax error, so definitely check for correctness before running. You probably won't catch this unless you change the end of the statement to 2>&1 & to get stderr to redirect to stdout, but since you're running a python script, I don't think this would help you.

Lastly, you can kill the process created by nohup by either killing the PID given to you by the command, or using ps -ef | grep <main.log>

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