linux cron job to create file using python

Question

bash script,

#! /bin/bash

echo 'hi bash'

aa
python ~/fledgling/cron/test.py

echo 'after python script'

here aa is alias, which activates virtualenv

alias aa='cd /home/fledgling/projects/myblog/base'

python script,

import time

with open('~/fledgling/cron/%s.txt' % time.strftime("%Y_%m_%d__%H:%M:%S"), 'w') as f:
    f.write('%s' % time.strftime("%Y_%m_%d__%H:%M:%S"))

I want to to run this python script for every one minute.

crontab,

* * * * * ~/fledgling/cron/test.sh >> ~/fledgling/cron/log.txt

contents of ~/fledgling/cron/log.txt ,

hi bash
after python script

Output of /var/log/syslog

 ✘ ✝ ~/fledgling/cron  tail -f /var/log/syslog  
Jun 24 13:46:01 mysys CRON[14697]: (mysys) CMD (~/fledgling/cron/test.sh >> ~/fledgling/cron/log.txt)
Jun 24 13:46:01 mysys CRON[14696]: (CRON) info (No MTA installed, discarding output)
Jun 24 13:47:01 mysys CRON[14736]: (mysys) CMD (~/fledgling/cron/test.sh >> ~/fledgling/cron/log.txt)
Jun 24 13:47:01 mysys CRON[14735]: (CRON) info (No MTA installed, discarding output)
Jun 24 13:48:01 mysys CRON[14747]: (mysys) CMD (~/fledgling/cron/test.sh >> ~/fledgling/cron/log.txt)
Jun 24 13:48:01 mysys CRON[14746]: (CRON) info (No MTA installed, discarding output)
Jun 24 13:48:11 mysys crontab[14769]: (mysys) BEGIN EDIT (mysys)
Jun 24 13:48:59 mysys crontab[14769]: (mysys) END EDIT (mysys)
Jun 24 13:49:01 mysys CRON[14794]: (mysys) CMD (~/fledgling/cron/test.sh >> ~/fledgling/cron/log.txt)
Jun 24 13:49:01 mysys CRON[14793]: (CRON) info (No MTA installed, discarding output)

Permissions,

-rw-rw-r--  1 mysys mysys  476 Jun 24 13:57 log.txt
-rwxrw-r--  1 mysys mysys  153 Jun 24 13:37 test.py
-rwxrwxr-x  1 mysys mysys   91 Jun 24 13:32 test.sh

What I want ? I want to create text file every minute.

What is my problem ? I can see in log that after every minute bash script is running with no error, then why python script is not getting executed or not creating any text file ?

#! /bin/bash should be no space. ~ Where do you think that is going? — 123
– 123, Commented Jun 24, 2016 at 8:41

WKPlus · Accepted Answer · 2016-06-27 09:12:08Z

1

The problem is that you can not use ~ in python, which will be expanded in shell not python.

Since mentioned by some answers, one thing to declared is

A space after #! is optional.

I saw this from wikipedia, and I have checked that on my Mac, it's true.

edited Jun 27, 2016 at 9:12

answered Jun 24, 2016 at 8:44

WKPlus

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Comments

Benjamin · Accepted Answer · 2016-06-24 08:48:59Z

0

No ~ in Python
No space after ! in bash header
Not sure bash launched by cron will guess your alias
Not sure crontab accept ~
Look at your log (/var/log/syslog maybe)
Try redirect 2>/tmp/debug.log in crontab
check if test.sh is executable

answered Jun 24, 2016 at 8:48

Benjamin

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Andreas Louv · Accepted Answer · 2016-06-24 09:42:46Z

0

If You are running that script on server then You may not be using:

os.path.expanduser('~')

edited Jun 24, 2016 at 9:42

Andreas Louv

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answered Jun 24, 2016 at 8:56

Safal Arora

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Comments

pavel pavlov · Accepted Answer · 2016-06-24 12:26:39Z

0

In your shell script use the full path rather then an alias.

aa=/home/fledgling/projects/myblog/base

cd $aa

answered Jun 24, 2016 at 12:26

pavel pavlov

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