Cron is a time-based job scheduler in Unix-like computer operating systems. Cron enables users to schedule jobs (commands or shell scripts) to run periodically at certain times or dates.

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Why is cron using a different Ruby than my user and how to fix it?

I have a cron job that is a Ruby script. The problem is that the ruby executable is different than expected. Ruby was installed from source so it should be the new global default. $ ssh ...
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1answer
642 views

Cron won't use msmtp to send emails in case of failed cronjob

I'm trying to configure a machine so that it will send me an email if one of the cronjobs output something in case of an error. I'm using Debian Wheezy. Cron is working normally (without the email ...
2
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1answer
150 views

Why is cron mailing me program output even though I've redirected to /dev/null?

I'm trying to restart a system process through cron and getting emailed the startup output of the process. I thought redirecting STDOUT and SDTERR to /dev/null would "silence" the output but alas, ...
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0answers
41 views

need at jobs identified by name (advanced atd daemon)

Sometimes I'd like to delete or overwrite (or simply cat) an at job. Unfortunately, the at jobs are identified by a sequential number (file in /var/spool/cron/atjobs), which makes those operations ...
2
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2answers
640 views

Including file into crontab config?

I'm trying to put project specific crontab config into code repository to make it easy to update cron jobs on all backends when deploying. Is it possible to include files into crontab config? ...
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2answers
3k views

Centos backup mysql using cron job

According to this tutorial http://www.a2hosting.com/kb/getting-started-guide/backing-up-your-data/backups-on-dedicated-servers-and-vps trying to backup mysql database I did: 1) created folders in ...
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1answer
1k views

Crontab maximum command length

Is there a limit of characters a command in a crontab could be ? I have a crontab with a 178 characters command and it seems to be truncated at 164 when executed. I can tell this number from the ...
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1answer
259 views

Unable to get cron to append output from wget

I have a cronjob setup and running, but the logfile keeps getting overwritten every time it runs. I would like for the wget output to be appended each time the cron runs. Why is this and how do I fix ...
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1answer
320 views

(bsnmpd), uid 0: exited on signal 6 (core dumped) / Syntax error: word unexpected (expecting “then”)

I'm using FreeBSD 9.2-RELEASE: # uname -a FreeBSD f9.alexus.org 9.2-RELEASE FreeBSD 9.2-RELEASE #0 r255898: Thu Sep 26 22:50:31 UTC 2013 root@bake.isc.freebsd.org:/usr/obj/usr/src/sys/GENERIC ...
4
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1answer
220 views

Why is crontab file periodically overwritten?

I have a Ubuntu 12.10 server with an nginx user that I use to edit a crontab file. Periodically (maybe once every few hours? it's hard to tell), I notice that edits I have made as the nginx user have ...
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1answer
200 views

Understanding my Cronjob and the logs (Debian) [closed]

I'd like my cronjob to run every 5 minutes. It should execute a command which a user can only run from a certain directory. In my:/home/alias/laravel/ directory, I can manually run (as user alias) ...
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1answer
234 views

CentOS 6.3: logrotate and btmp

I had to configure logrotate on a server configured by other system-network administration. First of all I detected that there is no crond, so I had to install sudo yum install vixie-cron. All other ...
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2answers
167 views

running a cron job on a time interval [duplicate]

Is it possible to run a job for 2 hours at a specific time? So lets say I want to run wget command that calls/hits an endpoint in my web app for 2 consecutive hours in a day. Meaning that every single ...
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1answer
46 views

Include executed cron command when outputting to log

Is there a way I can include the command that was executed in the output when I'm logging to a file? For example: * * * * * date && /path/to/php /path/to/script.php >> cron.log ...
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1answer
33 views

Cron: where is the /etc/cron.d defined? Is it possible to add a new directory?

In CentOS, where is the /etc/cron.d folder defined? Is it possible to add a new folder that works exactly as it? Example: I have another folder ( /mnt/software/cron ) full of files with the exact ...
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1answer
141 views

dhclient asking for new routing every 1500 seconds, removing my static routing, cron not working

I have a problem with cron job on my ubuntu server 12.04. I have two internet providers - one for fast speed, second - for local resources. So, I'm using command route to up the static routing for ...
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3answers
2k views

How can I run a Cron job to make backups of a MySQL server by SSH

I have a production server running CentOS with a MySQL database. At home, I have a QNAP NAS (runs a little embed linux). I want to make a Cron job on my NAS to backup the data from my CentOS ...
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1answer
80 views

Crontab issue with specific days execution

We have a cron job under a specific user's crontab which should be running only on working week days. Job was running all days before we changed it. After we changed in the following line the days ...
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2answers
224 views

Not sure how to set up cronjob properly to run php function

Im not sure on how I should do to set up a cronjob to run a php function for my website, and doing so by using a URL. I dont want any output etc, I just want the cronjob to run the php function buy ...
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1answer
100 views

Can't stop LAMP graceful restart

I just got my first LAMP up and running, everything works fine except that my server is restarting itself every sunday. When I read the logs I see "Graceful restart requested, doing restart" Should ...
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2answers
3k views

Setting timeout for cron jobs

Do Ubuntu Linux cron (Vixie cron?) support setting timeout for its jobs? Specifically, the process would be killed after X seconds unless it finishes successfully by then. I have had some cases ...
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3answers
566 views

Are Linux cron Jobs each executed sequentially or in parallel?

Lets say I create two cron jobs: Cron Job A, runs every day at 8:00AM Cron Job B, runs every day at 8:05AM However, Cron Job A, takes 12 hours to run (don't ask why, this is an example). Will ...
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1answer
514 views

Why won't this shutdown shell script work under root's crontab when the guest user is logged in? [closed]

I've got a laptop running Lubuntu 13.04 and guest account enabled. People forget to shut it down every day so I figured I'd just put a one line script into root's cron to solve that. No dice. It shows ...
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1answer
425 views

cron.hourly script executing multiple times

The setup I have a script /etc/cron.hourly/msm-hourly that contains this: #!/bin/sh LOGPATH='/opt/msm/servers/cronscripts' LOGFILE="$LOGPATH/msm-start.log" # Make restart dead servers echo "" ...
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1answer
597 views

Crons not working on ISPConfig3

I have a CentOS LEMP stack with ISPConfig3. Everything is working perfectly, except for the cron jobs. I have tested the commands from command line, and they seem to be working fine, but when I put ...
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1answer
685 views

How can I check cron task it's running? [duplicate]

I put a cron script in /etc/cron.d: [root@node ~]# cat /etc/cron.d/reconfig 0 */6 * * * root /root/bin/reconfig.pl But I get no list of cron tasks for root: [root@node ~]# crontab -l no crontab ...
2
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1answer
50 views

Aggregating emails from cron and cfengine

I've recently taken over administration of a decent size network (900 FreeBSD or Linux hosts across 10 physical sites) where we get a lot of email destined for root, mostly from cfengine (v2). We've ...
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1answer
263 views

cron job not running the script that start vncserver

Hi I wrote a script to start my vncserver when I call it manually via command line. It works as follows: the script is in usr/bin I gave it the right authorization (chmod u+x startvnc) but wen I ...
0
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3answers
177 views

script bash can't get difference in $PS1 or $- when running interactivelly or via cron

I want my cron scripts being executed verbosly when run interactively by a system user (for debug purpose for instance) and quietly otherwise (for cron, as I want receive e-mail if and only if I get ...
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2answers
360 views

crontab failing to start service via working script

My script works when ran by itself but not via crontab Crontab [root@someserver:/]# crontab -l SHELL=/bin/bash ...
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1answer
4k views

What cron job is /usr/lib/sa/sa1

I have logwatch enabled for my machine. Suddenly I see this line in my logwatch /usr/lib64/sa/sa1 1 1 : 4297 times /usr/lib64/sa/sa2 -A : 29 times run-part /etc/cron.hourly : 716 I tried crontab -e ...
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2answers
63 views

Is there a way to source cron jobs from a file

One of our servers has around 20-25 different cron jobs scheduled on it. Usually, we periodically check-in the cron jobs to a file in the repo using crontab -l > cron.jobs While bringing up a new ...
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2answers
50 views

Can I combine Cron special string “@reboot” with regular scheduling?

In the Cron manpage it mentions the special string "@reboot". Can I combine this with a regular schedule? The goal is simply to schedule a job to run once a day AND immediately in the event of a ...
1
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1answer
656 views

Strange syslog for my server

Today i go on my log with nano /var/log/syslog I have this, and i think it's not very good : Aug 27 06:25:02 ks3309528 rsyslogd: [origin software="rsyslogd" swVersion="4.6.4" x-pid="2235" ...
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2answers
387 views

check if process is running, even under cron

I have a cron job that runs every minute, but if it finds data, might take many minutes to finish. I need to tell if another instance of the script is running from another. To make things even more ...
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3answers
127 views

How can a sh script determine if it was started as a cron job as opposed to interactive or background?

I'd like to use the same scripting for cron and interactive, just wondering if there was a universal way over UNIX/Linux systems to easily make this determination.
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2answers
963 views

Cron permissions (root, usergroup) - could not open input file [closed]

I have a server for which I have created a cron job "sendalerts" to users. Mind you this "sendalerts.php" should be runnable from two methods (via browser and also via a cron job) So cron's job is to ...
2
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2answers
2k views

Incrond running but not executing commands CentOS 6.4

I have copied this question over here from StackOverflow... I have installed incron from the EPEL repository (0.5.9) (before you ask; YES, I also tried downloading the source and compiling locally ...
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1answer
131 views

Script doesn't work as cron job [closed]

I have a script that I wrote to verify on an OS X machine (v 10.7.4) if a volume is up or down. If it goes down, it is supposed to send an email. When I run the script from the command line, it works ...
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1answer
351 views

How to stop long-running cron process from being killed

I have a long-running cron process, running a Python script, that seems to get randomly killed. In dmesg I see: [230568.077358] init: cron main process (890) killed by TERM signal [237517.974422] ...
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198 views

Cron sends e-mails but shouldn't

I'm getting crazy. Cron bombs me with e-mails, even if I set a nullstring as e-mail address and pipe the output to /dev/null. Currently my crontab looks like this MAILTO="" # m h dom mon dow ...
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1answer
200 views

cron create output file only if there is output

I have a cronjob that calls a script. I want the output to be placed in a log file. The problem is that the log-file is created even if there is no output. Since the job runs once an hour, and ...
0
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1answer
493 views

Issue with ifconfig in a shell script (using cron)

If I execute this script manually in Debian: #!/bin/bash /sbin/ifconfig wlan0 down /sbin/ifconfig wlan0 up sudo iwconfig wlan0 essid "WLAN_NETWORK" sudo iwconfig wlan0 key myPassword sudo dhclient ...
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1answer
140 views

celery tasks from one domain appear on another domain's django admin hosted on the same box

I have a rather funny problem that I didn't manage to find it elsewhere. I have 2 django-celery projects running with redis on 2 different domains, but apparently hosted on the same box. I don't have ...
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1answer
62 views

Strange crontab behaviour [duplicate]

This evening I have been playing with cron for the first time, and have started experiencing strange results. The script that I am trying to run is a watchdog that allows me to manage a couple other ...
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2answers
153 views

Redirect output from cron in real time, not after program has finished?

I have a ruby script that writes to STDOUT and sometimes STDERR. I am running this script every 5 minutes via a crontab: */5 * * * * /root/myscript.rb >> /var/log/myscript.log 2>&1 What ...
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1answer
341 views

Cron job does not generate expected log file

I'm trying to execute a shell with crontab. The cron job executes the shell but doesn't generate the log file i need. This is what i'm using for my cron: 10 * * * * /home/user/3nvo.sh This is a ...
0
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2answers
1k views

Ubuntu Crontab or init script startup [duplicate]

What am I doing wrong here with cron on boot? Example: To launch manually: screen -S example ./script.sh To recover manually: screen -x example now, I just try to do the same thing (well, the ...
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1answer
151 views

CRON to run every 15 minutes for one week?

How do I create a CRON job so that it runs every 15 minutes (24 hours a day) but for one week only and exits? Thanks!
4
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1answer
285 views

How can I create cron jobs in specific files on Linux Centos

I want to have a separate folders for cron jobs like: /mydata/cronjobs Now in that folder I want to have files like backup_server which will have the content like: 30 3 * * 1-5 ...