How to run a python script with CRON on Debian?

Question

I want to run a script in every X hours, that's why I wrote a BASH (named as mybash.sh) what is calling this script like this :

#!/bin/bash PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/sbin:/usr/src/Python-2.7.13 python /usr/src/Python-2.7.13/test1.py

This bash file is in my /usr/src/Python-2.7.13 , and my test1.py too. If I am running the sh mybash.sh it is running! I did chmod a+x mybash too.

Into the crontab-e I wrote that:

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/sbin:/usr/src/Python-2.7.13 
* * * * * /usr/src/Python-2.7.13/mybash.sh 2>&1

If I am calling the crontab-l I am seeing these lines there.

But my script not running..What am I missed?

EDIT1 - cat /etc/crontab

# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# m h dom mon dow user  command
17 *    * * *   root    cd / && run-parts --report /etc/cron.hourly
25 6    * * *   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47 6    * * 7   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52 6    1 * *   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
#

Because I read that, it is the usual process to run a .py file with the cron. — Harley
– Harley, Commented Oct 9, 2017 at 6:52
what does the script do? also, why are you not using the python interpreter that comes with Debian? — umläute
– umläute, Commented Oct 9, 2017 at 10:06
the script is web-scraping (open some websites), how can I use it? — Harley
– Harley, Commented Oct 9, 2017 at 10:14
does the script require a GUI? (open a browser?). what do you have in /var/log/cron.log? what does the user under which the cron-scrip is being executed get in the ${MAIL} file? (when replying, please use "@umläute" so i get notified) — umläute
– umläute, Commented Oct 9, 2017 at 12:29

Wyatt Gillette · Accepted Answer · 2017-10-09 10:04:45Z

0

You could simple invoke python in the crontab

* * * * * [path/to/py/executable] [path/to/py/script]

Remember to specify the complete path to executable due to restricted variables in cron environment.

answered Oct 9, 2017 at 10:04

Wyatt Gillette

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12 Comments

Harley Over a year ago

So i have to write maybe this one? : * * * * * /usr/src/Python-2.7.13/mybash.sh /usr/src/Python-2.7.13/test.py ?

Wyatt Gillette Over a year ago

nope, i mean, for example * * * * * /usr/bin/python /usr/src/Python-2.7.13/test.py

Wyatt Gillette Over a year ago

no output neither mail log? Are u sure u found the right python path? If u put /usr/bin/python (or whateaver) in a shell, it spawns Python interpreter?

Harley Over a year ago

i am sure, because my python program is start with #!/usr/bin/python and #!/bin/sh . So i don't know why it cant start

Wyatt Gillette Over a year ago

so, i cant help you there 'cause it should be good... just a stupid question, have you inserted the blank like at the end of crontab? maybe post the result of cat /etc/crontab here, if it's not too long

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