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cron not executing python3

Addition to cron is not executedCron not call sh scriptCrontab or cron.d to run a wav file. What am I doing wrong?Script not working with crontab, works manuallyPython script run from crontab does not recognize USB drive mounted laterCannot execute Python3 RPi.GPIO import from shell/rc.localAutomatically launching a script after full bootAutostarting a python script at boot not working in /etc/rc.local and systemdYA Cron QuestionHow to run a script which uses I/O's on startup?

0

I am running Raspbian Stretch and have a python 3 script that executes correctly when I am in the relevant directory and input it in the command line as:

sudo python3 Example.py

The shebang #! line is in the script as follows:

 #!/usr/bin/env python3

And made the script executable with:

sudo chmod +x Example.py

I've tried several variation of below within crontab -e to no avail

10 * * * * python3 /home/pi/Desktop/Example.py

raspbian-stretch python-3 cron

share|improve this question

asked 14 hours ago

Dan B RaelinDan B Raelin

257

add a comment | 

0

I am running Raspbian Stretch and have a python 3 script that executes correctly when I am in the relevant directory and input it in the command line as:

sudo python3 Example.py

The shebang #! line is in the script as follows:

 #!/usr/bin/env python3

And made the script executable with:

sudo chmod +x Example.py

I've tried several variation of below within crontab -e to no avail

10 * * * * python3 /home/pi/Desktop/Example.py

raspbian-stretch python-3 cron

share|improve this question

asked 14 hours ago

Dan B RaelinDan B Raelin

257

add a comment | 

I am running Raspbian Stretch and have a python 3 script that executes correctly when I am in the relevant directory and input it in the command line as:

sudo python3 Example.py

The shebang #! line is in the script as follows:

 #!/usr/bin/env python3

And made the script executable with:

sudo chmod +x Example.py

I've tried several variation of below within crontab -e to no avail

10 * * * * python3 /home/pi/Desktop/Example.py

raspbian-stretch python-3 cron

share|improve this question

asked 14 hours ago

Dan B RaelinDan B Raelin

257

sudo python3 Example.py

 #!/usr/bin/env python3

sudo chmod +x Example.py

share|improve this question

asked 14 hours ago

Dan B RaelinDan B Raelin

257

share|improve this question

asked 14 hours ago

Dan B RaelinDan B Raelin

257

asked 14 hours ago

Dan B RaelinDan B Raelin

257

asked 14 hours ago

Dan B RaelinDan B Raelin

257

2 Answers
2

active

oldest

votes

5

As is typical with crontab issues. The environment is not the same as your user or even a sudo/root shell , and env python3 may not return anything (env simply searches through

Instead you should explicitly use the full path of python which can be found either as which python3 or which $(env python3) and use that full path in your crontab (typically /usr/bin/python3 but it is also valid to use one installed elsewhere , e.g. a virtualenv directory)

If your script or program relies on being in the same directory, make sure to change directory

cd /path/to/dir && /usr/bin/python3 ./Example.py

share|improve this answer

edited 3 hours ago

Seamus

2,4791220

answered 14 hours ago

crasiccrasic

2,301318

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Note shebangs are ignored when called script is called explicitly as argument to python
  
  – crasic
  14 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The script should also cd <relevant directory>.
  
  – Ingo
  11 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Ingo this is not strictly necessary unless Example.py uses relative paths to CWD in it's logic, using the full path of the script is also acceptable in many instances. I will edit for completeness
  
  – crasic
  10 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Maybe, but I have seen many python scripts that cannot find its custom modules if not executed from its current directory.
  
  – Ingo
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is there a downside in just including the change directory when adding a .py in crontab? (for future reference on best practices)
  
  – Dan B Raelin
  8 hours ago
  

  
  
  
  

 | 
show 1 more comment

1

Try the following in crontab:

sudo python3 /home/pi/Example.py

You need the full path to Example.py

You don't really need the shebang.

Or sudo crontab -e for the root crontab with:

python3 /home/pi/Example.py

share|improve this answer

answered 12 hours ago

Steve AmorSteve Amor

111

New contributor

Steve Amor is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  The script should also cd <relevant directory>.
  
  – Ingo
  11 hours ago
  
  
  

  
  
  
  

add a comment | 

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5

As is typical with crontab issues. The environment is not the same as your user or even a sudo/root shell , and env python3 may not return anything (env simply searches through

Instead you should explicitly use the full path of python which can be found either as which python3 or which $(env python3) and use that full path in your crontab (typically /usr/bin/python3 but it is also valid to use one installed elsewhere , e.g. a virtualenv directory)

If your script or program relies on being in the same directory, make sure to change directory

cd /path/to/dir && /usr/bin/python3 ./Example.py

share|improve this answer

edited 3 hours ago

Seamus

2,4791220

answered 14 hours ago

crasiccrasic

2,301318

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Note shebangs are ignored when called script is called explicitly as argument to python
  
  – crasic
  14 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The script should also cd <relevant directory>.
  
  – Ingo
  11 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Ingo this is not strictly necessary unless Example.py uses relative paths to CWD in it's logic, using the full path of the script is also acceptable in many instances. I will edit for completeness
  
  – crasic
  10 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Maybe, but I have seen many python scripts that cannot find its custom modules if not executed from its current directory.
  
  – Ingo
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is there a downside in just including the change directory when adding a .py in crontab? (for future reference on best practices)
  
  – Dan B Raelin
  8 hours ago
  

  
  
  
  

 | 
show 1 more comment

5

As is typical with crontab issues. The environment is not the same as your user or even a sudo/root shell , and env python3 may not return anything (env simply searches through

Instead you should explicitly use the full path of python which can be found either as which python3 or which $(env python3) and use that full path in your crontab (typically /usr/bin/python3 but it is also valid to use one installed elsewhere , e.g. a virtualenv directory)

If your script or program relies on being in the same directory, make sure to change directory

cd /path/to/dir && /usr/bin/python3 ./Example.py

share|improve this answer

edited 3 hours ago

Seamus

2,4791220

answered 14 hours ago

crasiccrasic

2,301318

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Note shebangs are ignored when called script is called explicitly as argument to python
  
  – crasic
  14 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The script should also cd <relevant directory>.
  
  – Ingo
  11 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Ingo this is not strictly necessary unless Example.py uses relative paths to CWD in it's logic, using the full path of the script is also acceptable in many instances. I will edit for completeness
  
  – crasic
  10 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Maybe, but I have seen many python scripts that cannot find its custom modules if not executed from its current directory.
  
  – Ingo
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is there a downside in just including the change directory when adding a .py in crontab? (for future reference on best practices)
  
  – Dan B Raelin
  8 hours ago
  

  
  
  
  

 | 
show 1 more comment

As is typical with crontab issues. The environment is not the same as your user or even a sudo/root shell , and env python3 may not return anything (env simply searches through

Instead you should explicitly use the full path of python which can be found either as which python3 or which $(env python3) and use that full path in your crontab (typically /usr/bin/python3 but it is also valid to use one installed elsewhere , e.g. a virtualenv directory)

If your script or program relies on being in the same directory, make sure to change directory

cd /path/to/dir && /usr/bin/python3 ./Example.py

share|improve this answer

edited 3 hours ago

Seamus

2,4791220

answered 14 hours ago

crasiccrasic

2,301318

share|improve this answer

edited 3 hours ago

Seamus

2,4791220

answered 14 hours ago

crasiccrasic

2,301318

edited 3 hours ago

Seamus

2,4791220

edited 3 hours ago

Seamus

2,4791220

answered 14 hours ago

crasiccrasic

2,301318

answered 14 hours ago

crasiccrasic

2,301318

1

Try the following in crontab:

sudo python3 /home/pi/Example.py

You need the full path to Example.py

You don't really need the shebang.

Or sudo crontab -e for the root crontab with:

python3 /home/pi/Example.py

share|improve this answer

answered 12 hours ago

Steve AmorSteve Amor

111

New contributor

Steve Amor is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  The script should also cd <relevant directory>.
  
  – Ingo
  11 hours ago
  
  
  

  
  
  
  

add a comment | 

1

Try the following in crontab:

sudo python3 /home/pi/Example.py

You need the full path to Example.py

You don't really need the shebang.

Or sudo crontab -e for the root crontab with:

python3 /home/pi/Example.py

share|improve this answer

answered 12 hours ago

Steve AmorSteve Amor

111

New contributor

Steve Amor is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  The script should also cd <relevant directory>.
  
  – Ingo
  11 hours ago
  
  
  

  
  
  
  

add a comment | 

Try the following in crontab:

sudo python3 /home/pi/Example.py

You need the full path to Example.py

You don't really need the shebang.

Or sudo crontab -e for the root crontab with:

python3 /home/pi/Example.py

share|improve this answer

answered 12 hours ago

Steve AmorSteve Amor

111

New contributor

Steve Amor is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this answer

answered 12 hours ago

Steve AmorSteve Amor

111

New contributor

Steve Amor is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 12 hours ago

Steve AmorSteve Amor

111

New contributor

Steve Amor is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 12 hours ago

Steve AmorSteve Amor

111