cron is a task scheduler based on clock time that runs on Linux-based machines.

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os.popen returns empty string when called from cron

I'm trying to get my Raspberry Pi's CPU usage like so: def get_cpu_usage(): return os.popen("top -n1 | awk '/Cpu\(s\):/ {print $2}'").readline().strip() When executed normally, this method ...
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2k views

Why does this crontab file only run once?

I have the following crontab file: 2 * * * * /bin/date >> /home/jon/date_from_cron.txt I think this means "run every two minutes". However, it only runs once. Shortly after setting up this ...
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813 views

Logrotate Error

When using logrotate from a cronjob, I am getting this erros: error: unable to open /var/log/mylog.1 for compression Does any one know what does it mean and how can I fix it ?
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1k views

JAVA main class not found when using Apple auto-ingest tool

I am trying to setup a cronjob to download my daily and weekly reports from iTunes Connect. I have downloaded Apple's Autoingestion.class and I have made the following shell script to download the ...
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4answers
202 views

Cronjob not working

I've got a simple crontab for ripping my local radio station only when I want: 0 16 * * 0 /root/streamripper.sh 0 17 * * 0 killall streamripper 0 20 * * 0 /root/streamripper.sh 0 21 * * 0 killall ...
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12k views

How to create a cron job to upload files to an FTP server

I would like to create a cron job that uploads files from a directory on my computer to my FTP server. I would like it to do it daily at midnight. I know pretty much nothing about cron, so I ...
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683 views

The 'which' command returns nothing via cron, but works via console

I've written a little utility in haXe + Neko that needs to execute some GIT commands. To avoid hardcoding the path to the GIT executable I'd like to use the which command to find out where it is. ...
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2k views

Schedule a cron job ev X minutes, but exclude it from certain hours in the morning?

Is it possible to make a cron job run say, every 20 minutes, but make it not run for say, 1-4 in the morning.
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What's wrong with my cron job time schedule?

I'm trying to setup cron jobs for a website hosted on hostmonster.com. When I use the following it runs perfectly: * * * * * But whenever I make changes to these timestamps the script doesn't ...
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399 views

Run Crontab anytime after 4pm

I am trying to run a script through crontab in osx 10.8.5 that will run at 4:30. 30 16 * * 1-5 /Library/Frameworks/Python.framework/Versions/2.7/bin/python /Users/lego90511/PycharmProjects/Stock\ ...
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97 views

Why this cronjob wont run

On debian squeeze as user root I add this cronjob with "crontab -e" */1 * * * * root /usr/sbin/ntpdate ptbtime1.ptb.de >> /var/log/ntpdate.log But this cronjob will not run, there is also ...
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2k views

How to run a script at boot time for normal user?

I want to run a bash script at boot time in CentOS 6. I added the script in /etc/init.d/ directory but all these script are run by root. I want to run script for any user.
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3k views

CRON what is correct time code for every 6 hours?

I just want to know which one should work just fine for Run every 6 hours forever: 0 */6 * * * or * */6 * * * Thanks
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1answer
410 views

Difference between 0,10 and */10 for crontab?

I wanted to run a cron every 10 minutes. What's the difference between the syntax 0,10 and */10?
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470 views

Why cron saves at /root, when should at /var/www?

Why my cron */1 * * * * /usr/bin/php /var/www/query/query.php &> /root/querylog.log saves query.php output in the /root/ folder? (this script shall save *.txt at its location) It should do so ...
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886 views

Writing a cron job to email myself

How would i write a simple cron job to email myself a message at a certain time? Also is it possible to create a cron job without root access. I'm trying to use my school's server?
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2k views

Open a terminal from a Crontab

How do I get a gnome-terminal window to open from a crontab? I have tried this: * * * * * /usr/bin/gnome-terminal * * * * * source /home/user_name/.bashrc ; /usr/bin/gnome-terminal * ...
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716 views

Cron fails to run bash script

I have bash script #!/bin/sh DTFILE=/etc/daytime.addr DTPORT=13 DAYTIME_ERROR=/tmp/dtm.err function daytime_error(){ if [[ -z $1 ]] then exit 1 fi if [[ -e $DAYTIME_ERROR ]] ...
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21 views

Running executable from Crontab

I have a file called Exim_queue_size in the root directory. It contains one line: exim -bpc | mail -s'Exim_queue_size' bert@example.com It has had its permissions set with chmod +x , and is thus ...
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cron table mailx caused empty content

I'm using centos 7.0/6.5. The content of /etc/cron.hourly/mail.cron #!/bin/sh log=/var/log/mail.cron.log echo "`hostname` `date`" >> $log 2>&1 mailx -s "test mail" me@example.com < ...
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362 views

Permission Denied in Crontab

I've searched half a day for the answer to this, with no luck. Any assistance will be appreciated. I have a PHP script that modifies the crontab, loads a new cron job, removes some etc. The script ...
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104 views

Executing PHP from crontab

I am utilizing crontab to execute a PHP file as follows: 0 4 * * * /opt/lampstack/php/bin/php /opt/lampstack/apache2/htdocs/tests/test.php I am pretty sure that the file itself is working properly ...
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205 views

How do you use the run-parts command?

For some reason my crontab is not running the hourly/weekly/etc scripts. It seems to be that run-parts is not working and I cant get it to work on my local machine as well. Is there a mistake in the ...
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469 views

Cronjob for first day of month except sunday

I have such entry in my crontab: 0 0 1-2 * 1-6 It is correct that it would run at 00:00, 1st or 2nd day of the month from Monday to saturday? For example, if 1st day will be sunday then it would not ...
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83 views

Why doesn't this cron job run?

My cron job isn't running on my system. Any idea why? % ps aux | grep cron root 4213 0.1 0.2 5548 1496 ? Ss 12:40 0:00 /usr/sbin/crond -n crontab.txt: * * * * ...
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252 views

cron executing twice based on day of the week

I have a question. We have a cron job that executed on the 15th of this month: min hr day month day_of_week 35 13 15 6 6 However, it executed again on June 22nd (which was the 6th day of the ...
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1answer
231 views

I created Cron but I get errors that don't really understand

I created a crontab like this: 0 22 * * 2 /bin/echo " Hello World " 0 1 * * * /bin/echo " Test" but I receive mails like this, what does it mean? Subject: Cron /bin/echo " Test" ...
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100 views

Found this logentry on my server in the cron.logs, seems to be a hack-attempt, any suggestion for further proceeding?

Here is a logentry, which was executed: mkdir /root/.ssh/;echo "ssh-rsa <some unkown public-key> > /root/.ssh/authorized_keys I'm guessing that I was hacked. Any advice for cleaning up ...
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2answers
892 views

How do I run a rake task in cron under a different user?

I'm trying to run a backup script on ubuntu. My problem is that I'm trying to do this using the postgres user account that I setup on ubuntu. I believe having this account run the cron jobs is best ...
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2k views

What do slashes “/” mean in crontab?

I'm seeing slashes in some crontab examples, I don't understand what they mean? Check this one out for example */10 * * * * /home/ramesh/check-disk-space ...
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Cron Job timing

Lets say 0 0,12 * * * command is what you write a cron job, which runs twice a day on 00hour and 12th hour. How to write to do cron job twice a day but lets say on 2pm and 2am?
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Will cron on linux run the same job multiple times?

I am setting up an rsync backup job on linux (ubuntu 11.10 server). If the backup runs long, and is still running when the next scheduled time comes up, will cron start another instance of rsync? Or ...
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15k views

rsync cron job with a password?

I want to set up an rsync command as a cron job, so I need to find a way to supply my server password automatically to rsync. Currently I have a shell script that looks like this: #!/bin/sh rsync ...
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3k views

mysqldump cron not dumping

I am attempting to setup a cron to use mysqldump once a day. There is no output and I cannot see any database usage while watching top. The crontab is: mysqldump [database] -u[user] -p'[password]' ...
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5k views

Debug cron job - how to get results emailed?

I am trying to debug why my the support ticket system I am setting up is not pulling the POP email from my Google Apps email. I set up a cron job for this, per the instructions of the developer of ...
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597 views

Why is bash rsync script not writing anything to file?

Ubuntu 9.10 crontab -l 0 1 * * * /root/cron/rsync-93.193.99.111 &> /root/cron/rsync-93.193.99.111.log 0 3 * * * tail -100 /root/cron/rsync-93.193.99.111.log | msmtp me@myemail.com ls -l ...
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490 views

Linux cron job error

I have setup a cron job to run a PHP file every 30 minutes: lynx -source public_html/scripts/file.php The result comes through to an email but seems to get this error: Can't Access ...
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3answers
447 views

Ubuntu Crontab error

I want to list files at 12h01. How can I set my crontab to do this? pedro@Pedro-PC:~/PL/trab4$ crontab -l # 01 12 * * * ls -l
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cron job remove / delete file

I'm trying to set up a cron job to delete a file, I'm using a plesk interface, the command being: * * * * 1-7 rm /mypath/file_name_to_delete This should be executing every minute, right? It ...
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23 views

cron expression for every hour starting from specific time

Every one hour (starting from "now") I am able to schedule using this cron expression (expression) using nodejs cron-job. But I need to set cron every one hour starting from a specific time. For ...
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102 views

How to find out the reason why a scheduled task hang?

I have scheduled quite a number of tasks in my Windows 7, doing a variety of cron jobs on my machines. I am perfectly sure that these tasks, when run on their own, won't hang. But the problem is ...
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43 views

Why is this cron sometimes activing daily and sometimes every three days? (which it's intended to)

I have a line in my crontab like this: 01 6 * * */3 $TASK The variable $TASK emails me a particular email. I understand that I have written the cron to trigger this action at 06:01am every third ...
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839 views

RSYNC over SSH requesting password

I looked at numerous question but don't seem to find quite what I'm looking for. I've created a script in which I'm trying to run rsync over ssh, this will eventually be put into a cron job. The ...
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557 views

Script for transferring files over the internet via a Cron task

I want to add a bit to a backup script that will transfer a file to another server, over the internet. My cron currently does a pg_dump of a database into a file on the local machine, I want to then ...
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103 views

Job shows up in crontab -l but not in /etc/crontab

There is a certain job that shows up when I do $ crontab -l and I can verify that this is also running. However, the job is not listed in /etc/crontab. Say the job is /somedir/somefile I can't ...
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Simple Linux-based task scheduler with job dependencies?

I'm maintaining a data-warehousing system that involves a lot of dependent jobs (data import, transform, etc). I've been using Linux's crontab to manage them until the dependency between jobs get ...
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1k views

scheduling jobs on mac OSX 10.8.2

I am trying to schedule the execution of a .sh script on max OSX 10.8.2 I am using crontab and am getting an odd bug. If i am at the computer and set the task so that it executes in the next few ...
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113 views

Script acts differently whe run by cron

I have a script that runs nightly, that is returning different results than when I run it manually. I realise that this is a common question and my problem most likely lies in an environment variable ...
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416 views

run cron on ssh, error message

how to run the script below * * * * * /usr/bin/wget -O - -q "http://example.com/scheduler/cron" when i run the script, the error message show as below: $ * * * * * /usr/bin/wget -O - -q ...
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286 views

How do I fix my crontab after a username change?

I recently changed my username, and I can't seem to access my crontab now: % crontab -e crontab: no crontab for blackl - using an empty one I thought I'd just edit the one I had under my old ...