Running python scripts consecutively in Crontab

Question

I am attempting to run my compilation of scripts one after another every minute. Example: Assuming each script takes 2 seconds to finish:

start script 1 at 1:00, script 2 at 1:02, script 3 at 1:04, etc...

I assume it should look something like this

*/1 * * * * python script1.py && python script2.py && python script3.py

Your assumption should work as intended. Did you not try it? I'd only suggest to simplify your schedule to * * * * * which also fires every minute. — Christian Pekeler
– Christian Pekeler, Commented Dec 31, 2016 at 22:25

helloV · Accepted Answer · 2016-12-31 22:56:11Z

4

* * * * * python /path/to/script1.py ; python /path/to/script2.py ; python /path/to/script3.py

Use && if you want to run the second script only if the first script is successful (exit code is 0)

Use ; if you want to always run the second script irrespective of first script's exit code

Always provide full path to your script in crontab

answered Dec 31, 2016 at 22:56

helloV

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1 Comment

Doug Over a year ago

Correct. Cron does not load the user's profile. at, however, does load the profile.

codeforester · Accepted Answer · 2016-12-31 22:26:04Z

1

Your cron entry is fine.

You may want to create a wrapper script that calls all your scripts in sequence.

edited Dec 31, 2016 at 22:26

answered Dec 31, 2016 at 22:16

codeforester

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Comments

Joey Zhang · Accepted Answer · 2016-12-31 22:36:20Z

1

Your cron entry should work. However, you may notice that it may fail because you didn't specify the absolute paths for the scripts.

answered Dec 31, 2016 at 22:36

Joey Zhang

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2 Comments

ColeWorld Over a year ago

where can I view the log of the scripts? Or like the python shell of the scripts in terminal

Joey Zhang Over a year ago

If what you meant by log is the stdout of the script, then you need to redirect stdout to a log file. By default, you should receive a mail when the task got executed. Just type mail in your console to check your mails.

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