Thursday, May 5, 2022

[SOLVED] print and error both in same log file in bash

Issue

I have a simple python file as

test.py:

import time

i = 0

while True:
    print(i)
    time.sleep(5)
    i = i + 1

To run/ test this file I created a bash file

test.sh:

python '/home/pbm/python/test.py' >> /home/pbm/python/test.$(date +'%d_%m_%Y').log 2>&1 &

Why the value of print is not getting logged in log file? I need the print to be logged in log file and if any error occurs should be logged in the same file.


Solution

the print is buffering, you need to add flush=True:

while True:
    print(i, flush=True)
    ...

NB. this is for python 3



Answered By - mozway
Answer Checked By - Terry (WPSolving Volunteer)
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