Raspberry Pi Stack Exchange
Raspberry Pi Stack Exchange

Questions tagged [cron]

the job scheduler in Linux and other Unix-like operating systems. It enables users to schedule tasks to run non-interactively at specified intervals or predefined times, including upon reboot.

256 questions
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Where do Cron error message go?

I have a python script running by cron. For what ever reason, it is not running. I am wondering if there is anywhere that error messages are sent? Script runs fine by itself. If I run a simple script with crontab, that just writes to a file that…
Richard
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4 answers

Default shell for cron issue

I have some commands, they are working under bash, but not as cronjob. To see, what cause the problem, i'm saving the output in a file, here my example: 51 * * * * source ~/.rvm/scripts/rvm >> stack.log 2>&1 The content of the log file…
cupakob
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Execute a script at sunrise/sunset

Good afternoon, I'm trying to edit by soft, as a text file, the file that contains the crontab data. This is because I need to execute a series of functions daily, they are related to the sunrise and sunset, which vary from day to day. The idea is…
quito127
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5
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1 answer

crontab entry with parameters?

My goal was to make my Pi create its own WiFi on start so that I can connect to it wirelessly. I have succeeded by creating a crontab entry (using sudo crontab -e): @reboot /path/to/create_ap.sh & where create_ap.sh is a script launching…
YakovL
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4
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1 answer

systemctl daemon-reload issue

Since a last update, I get the follow message every day via mail: /etc/cron.daily/logrotate: Warning: Unit file of apache2.service changed on disk, 'systemctl daemon-reload' recommended. I tried to do systemctl daemon-reload of course (!), but…
zwolle-rdstk
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3
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4 answers

Addition to cron is not executed

I am trying to implement a watchdog script which I basically got from here. Script works fine, starts up process if not running, does nothing if running. Now implementation into crontab gives me headaches! Opened crontab in leafpad... (what are…
user5875
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2 answers

How to disable emails from Crontab?

I've got my Model B Pi setup running Raspbian OS. I have added a few jobs to Crontab and they're working very well. My problem is that I am getting an email each time a job runs. I don't need the emails right now, so is there a way to tell Cron /…
Peter
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What is the environment for cron?

When issues arise using cron to schedule events, a frequently-heard explanation is that cron runs with a different set of environment variables than a "normal" user (e.g. pi). That's all well and good, but what is the environment for the cron user?…
Seamus
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Cronjob deleted but cron still sends email

I have in /etc/crontab a job defined like this: 0,10,20,30,40,50 * * * * root /usr/lib/cgi-bin/awstats.pl -config=example.com -update I deleted this job but cron sends me still emails every ten minutes. How can I stop these emails? My OS is Raspbian…
wolf
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2 answers

Cron for Raspberry Pi

I'm running a program on one of my PIs that has a tendency to error out. I'm still trying to figure out the error but would like a cron entry (or maybe a python script, or most likely both) that will check on an hourly basis to see if the particular…
Ken
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1 answer

Cronjob does nothing?

Does anyone know about crontabs here? I've programmed a fine dust station with values ​​acquisition, LCD display and so on. The particulate matter station is to be exhibited at the university, but the prerequisite for this is that the respective…
Simon Deible
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Automatically shutting down the Pi after it's been idle for a certain period of time

I'm using my Raspberry Pi as a music server : I've installed MPD running under Archlinux ARM. I'd like to set a cronjob that would check wether MPD has been active for a given period of time and if it's beeni inactive, safely shutdown the system by…
Thomas
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Run transmission through cron

I am trying to run transmission torrent client using cron. I tried adding the below line to /etc/crontab 08 23 * * * pi transmission-gtk Nothing happens. tail /var/log/syslog says Apr 28 23:04:01 raspberrypi /USR/SBIN/CRON[3383]: (pi) CMD…
ATOzTOA
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How to use nano editor for super user (sudo)

I wonder how to edit crontab with nano editor for super user via sudo. I used the following command but it didn't work. crontab was open but it was not a nano editor. export EDITOR=nano sudo crontab -e
Adamtan
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cron.daily midnight download

I run a headless Pi in a weather station using cellular data. Every night after midnight it does an 8MB download - I don't know what it is, but that's what vnstat tells me. Being as how the system runs on cellular I'd like to kill that. Had a look…
Ian Boag
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