Why python scripts won't execute under cron even when you set shell and paths in crontab?

Rosa Abbott asked a question: Why python scripts won't execute under cron even when you set shell and paths in crontab?
Asked By: Rosa Abbott
Date created: Mon, Apr 26, 2021 3:27 PM

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FAQ

Those who are looking for an answer to the question «Why python scripts won't execute under cron even when you set shell and paths in crontab?» often ask the following questions:

😳 How do you execute shell script under linux?

Eithersh shellscript.shor./shellscript.sh

😳 How can you compile and execute shell scripts in unix?

Shell scripts are plain text files; they do not need to be compiled. To make these scripts executable, you need to add an executable flag using chmod. Consider the following example: $ chmod +x myscript

😳 How to execute linux commands in bash scripts?

How do I run . sh file shell script in Linux?

  1. Open the Terminal application on Linux or Unix.
  2. Create a new script file with .sh extension using a text editor.
  3. Write the script file using nano script-name-here.sh.
  4. Set execute permission on your script using chmod command : chmod +x script-name-here.sh.
  5. To run your script :

Question from categories: shell script logo shell script icon linux shell shell script example linux shell commands cheat sheet

1 other answer

The issue is probably not with the the path or pythonpath environment variables, this is easily fixed and checked. Most likely the script contains a bug when executed under cron. Some shell commands give slightly different output when executed under cron even when you specify the same shell in crontab, for instance the date may be formatted differently, causing a bug in your program when using the datetime module for instance. I noticed this behavior in cron even when you tell cron to execute under the same shell (bash). So you will need to log any errors when running your python programs under cron and essentially debug them twice. Particularly if you are embedding shell commands in your Python scripts or calling bash in Python. Or develop your script while running it under cron to check for any odd inconsistencies. For those whose problem is not with path environment variables, log the interpreter errors and debug your program again. Ex crontab: */1 * * * * /usr/local/bin/script.py > /var/log/script_log.txt 2>&1 For example the shell running under cron formatted the date differently with the output of some shell commands (all environment paths were consistent between the two shells): Sun Jan 18 12:00:59 2014, instead of Sun 18 Jan 2014 12:00:59

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