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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Executing php as sudo inside crontab [duplicate]

I've wrote a PHP-Script, and the execution requires sudo permission, because it executes some other system related stuff. So i've added this into the crontab -e but i can't see, that my script is ...
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37 views

Run Crontab command in jailed enviroment

I had created a user account in my server. And I created a jailed enviroments for that user. One thing i need is how to run crontab command in jailed enviroments. I tried add bash crontab to xxx/us/...
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1answer
81 views

What is the meaning of “+” in crontab file and why it works?

I've found this cron command on some Ubuntu server in /etc/cron.d/. 0 */3+2 * * * root <command goes here> Tried this on my PC with Ubuntu 14.04.3 LTS by adding the following file: /etc/...
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1answer
441 views

Run Cron daemon on OS X 10.10

I am maintaining some OS X 10.10 machines which require cron for various tasks (watchdog processes, /tmp cleaners, etc.). One of them has mysteriously stopped its cron daemon, and I can't seem to ...
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40 views

Cron output not working

Need help figuring this one out. I have the following script - /root/eximqueue.sh with the proper +x rights, etc: #!/bin/bash ######### Edit here ########## _mail_user=my@address.co.za # Set this to ...
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How to run script automatically after specific time? [duplicate]

I have two scripts to run backup task, one is for full backup, another one is for incremental backup. I want to run full backup at specific time every day, and run incremental backup every 10 mins ...
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18 views

Solution for backing up/copying from multiple destinations

We have 12 Debian servers that we want to copy a specific directory from to just one server on a weekly basis. This server will act as sort of a backup server. Any suggestions how to go about this?
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111 views

Cron jobs not working anymore

Cron jobs were working for months in the past but recently I had a high server load and now cron jobs aren't executing my php files (the same ones that were working before). When I check the cron log ...
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123 views

Running crontab on AWS auto scaling group

I have the following setup: 1 server with application X, that runs a crontab once an hour. The crontab connects to the database and runs some heavy calculations and exports data to a special data file ...
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2answers
84 views

Crontab - How to determine current active processes started by cron

We have a very sensitive application which heavily makes use of crontab and we would like to track of how many processes started by crontab are still running. In short, we have a limit of 300 cron ...
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77 views

Conditional block in crontab

Is it possible to put an "if" statement in a user's crontab, or is there another sensible way to organise lots of conditional cron jobs? From the end user's perspective, it would be easiest if they ...
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101 views

What does cron mail status 0x0047#012 Mean

I noticed in the mail log last night that I'm getting a new message: MAIL (mailed XXX bytes of output but got status 0x0047#012) The cron job did run successfully though (as it's a script that ...
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28 views

unable to force my cron job expression inside Hangefire tool to run on a specific hours

I am working on an asp.net MVC-5 web application. and i am using HangeFire tool to run background jobs. now i want my background job to run at 17 & 18 & 19 & 21 & 22 & 1. so i am ...
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330 views

Centos logrotate found error, skipping

One of our servers has a access_log which is nearly 5GB in size - there is currently no log rotation so I enabled it yesterday for httpd The contents of /etc/logrotate.d/httpd is /var/log/*.log { ...
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1answer
126 views

Script Works in Terminal, but Not as .sh

I have a script that works in the terminal perfectly, but for some reason won't fire off either in cron or when I run the script manually. I don't know if it makes a difference, but it's running on ...
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2k views

How precise is a cron daemon?

Is the cron job scheduler really precise? I mean, I need a script to run every night the latest possible, BUT before 00:00 of the next day. I'd ideally run a cron job at 23.59 (or 11:59 pm), but ...
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28 views

Unison on bootup

So i have unison running thru a config file by default. In here it applies the wait=watch function so it syncs automatically. but i wanted to run unison on boot, but i haven't been able to this this. ...
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56 views

Cron job execution time

I added a job for backup to my cron jobs, using crontab -e: 0 0 * * * tar -czf /somewhere/backup.tar.gz --exclude='sth/backup' --directory='/var/www' sth But when I check the created file, with ...
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116 views

Cron job with PHP script doesn't work properly

One of my customers have PHP script which loads cvs file. When he execute this script via WWW it works properly - logs of loaded data are stored in /var/php/CLIENT/loaded.log. But when i try to ...
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70 views

Read cron schedule from bash script

Is it possible to get the schedule for a running job? If i have this line in my crontab * * * * * /home/test/test.sh Can i read the * * * * * from test.sh, and only for that script? I hoped there ...
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2answers
504 views

Create a cron job to run redis every 30 minutes if it is not running

I want to create a cron job that will run redis every 30 minutes if it is not already running, but I don't know what I should do. I know that the beginning should look like this */30 * * * */<some ...
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1answer
52 views

Aws - Ubuntu - Cron job not running

I have a aws ec2 server with ubuntu on it. I did the following to set my cron sudo crontab -e 15,45 * * * * ubuntu /usr/bin/wget -O /dev/null https://mywebsite.com/cron/ But its not running.
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Puppet: Cannot find class cron

I'm using Puppet 3.4.3. I'm trying to use the cron type to manage cron jobs (as documented here: https://docs.puppetlabs.com/references/latest/type.html). However, any time I try and run my ...
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73 views

Cron: Execute python script, capture stdout & stderr and send via msmtp [duplicate]

I try this for almost 4 hours now, in different ways. I googled a lot, but nothing I try work as expected. I have a simple .msmtprpc file, that allows me to send mails like this: echo -e "Subject: ...
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3answers
981 views

Running a cronjob with different parameters each day

I am a programmer, and do not know a lot about crons, but I want to know if this is possible. Lets say I have an array [option1, option2, option3] and a script which I run in NodeJS called script.js. ...
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Crond is running twice with CentOS [closed]

I have the following issue that all of my cronjobs are running twice. When I do: ps aux | grep cron I see the following: root 1379 0.0 0.1 117296 1224 ? Ss Aug26 0:00 crond ...
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208 views

No log file output (or email with output) running Python script via cron job

I have the following cron job running a Python script which seems to install okay with no issues after creating it in Crontab and saving (this is on a server running Centos7). I'm not seeing either a ...
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1answer
72 views

Cron every 5 minutes 8h to 20h [duplicate]

I searched for 15 minutes and to me the syntax still isn't clear... would this: */5 8,9,10,11,12,13,14,15,16,17,18,19,20 * * * run the job every 5 minutes from 8(8am) to 20 (8pm)?
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176 views

auto-attach EBS volume to a Spot instance

I need some persistent storage across spot terminations. My approach to solve the problem is Write a startup script that attaches and mounts the persistent volume Snapshot this state and register ...
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82 views

Why does crontab store my crontab under /var/spool/cron/crontabs/user instead of /etc/cron.daily

I wanted to create a crontab doing some job for me. Because my server isn't running 24/7 i decided to use anacron instead. Ok, so I took a short look into /etc/anacrontab: 1 5 cron.daily ...
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701 views

How do I schedule a recurring reboot in CentOS 6.7?

I've run crontab -e and added this line to crontab to reboot my machine every morning at 1am. 0 1 * * * root /sbin/shutdown -r now When crond runs I see this in my logs Aug 20 01:00:01 stc-logs ...
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39 views

shell script to grep within range inside of cron

I'm trying to create a shell script that would look for ERROR inside of /var/log/jbossas/standalone/server.log, such as following: # grep ERROR /var/log/jbossas/standalone/server.log 10:36:37,530 ...
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17 views

How to launch cron job after editing crontab

I'm debugging a crontab and I would like to know if it's possible to launch a crontab right after editing. I need to know that the job will work within the cron environment. Now I'm trying to make ...
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1answer
52 views

running a long cron job - should I break it into smaller processes?

I have a PHP script that accesses the Amazon API at 11:00pm each night. The process takes a few hours. Will this lock up my server (haven't deployed it yet)? Is it best to run this in small batches?
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156 views

How to set Cron Job to empty cached directory

I have plain Ubuntu based server, i want to set Cron job and it will empty my website cache directory in every 24 hours, due to massive records 'rm -rf ' not work, so manually i used 'find . -name '' |...
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1answer
61 views

Python script crashes when run via Cron

I have a python script that completes exactly as expected when run manually as the root user. When I put the script into cron.daily it crashes 100% of the time. The error is a timeout error, but ...
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84 views

Why does crontab run twice while I set once everyday?

I used CentOS for Wordpress web server. I want backup media and SQL once per day, so I edit crontab as below: [john@cent ~]$ crontab -e TZ=Asia/Ho_Chi_Minh 15 3 * * * /bin/sh /home/john/deploy/job/...
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16 views

Stop crontab from filling syslog Ubuntu 15.04 [duplicate]

How can I prevent (certain cronjobs) from filling my syslog in Ubuntu 15.04? I have some jobs that run 4 times a minute and quickly fill up my syslog files. I've tried adding: cron.* ...
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582 views

php_network_getaddresses: getaddrinfo failed: Name or service not known openshift host

I'm using openshift host for develop a custom php application, all working good in local but I've a problem to establish a connection with my database of openshift. This is the configuration file for ...
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261 views

Stop crontab from filling syslog Ubuntu 15.04

How can I prevent (certain cronjobs) from filling my syslog in Ubuntu 15.04? I have some jobs that run 4 times a minute and quickly fill up my syslog files. I've tried adding: cron.* ...
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2answers
72 views

Preventing a user from running a script that should only be run by a CRON job?

I have a contact form on my site which uses $HTTP requests instead of reloading on the form submit. It's a really awesome feature, but it also opens up some nasty doors. My contact form sends an ...
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169 views

How to apply memory limits to all cron jobs?

On a shared server (Debian Jessie), there are some memory limits (and other limits, like number of processes) that apply for a group of users, configured in /etc/security/limits.conf. It seems that ...
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1answer
165 views

Logrotate script not uploading to s3

I am trying to use logrotate to upload log files from my rails and nginx commands once a day. When I run the logrotate command manually the files successfully upload, but it never does it on its own. ...
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19 views

Why does python 3 script not execute via crontab? [duplicate]

There's one little problem with my crontab and python 3 script. Currently I'm on VDS with Ubuntu 14.04 installed. There're 2 scripts that need to be executed via crontab in desired time. The first ...
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16 views

How to setup cron on Ubuntu 14.04 with php5-fpm [duplicate]

I have php5-fpm installed on Ubuntu 14.04 and I would like to create a cronjob to execute a script every 5 minutes.. Using crontab -e I created the following: */5 * * * * /usr/sbin/php5-fpm /home/...
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3answers
152 views

List all running cron jobs

Is there a way to see a list of running cron jobs on my server? I would like to see the name of the file being loaded or command. Plus how long it as been running. I am on CentOS.
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crontab not executing even when cron daemon is running [duplicate]

30 1 * * * sh /export/home/omega/report_scripts_cm/parse_subscriber_cdr.sh >> /dev/null 2>&1 30 2 * * * sh /export/home/omega/report_scripts_cm/active_subscribers.sh >> /dev/null 2>&1 30 3 1 ...
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Managing lab machines via cron and dsh

I'm a developer for a research lab. Our lab has 12 Ubuntu machines for test subjects that we control from a workstation using a variety of things (dsh for opening our experiments in chrome, wakeonlan ...
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1answer
355 views

expect script running screen stops working when run by cron

I hope this question is OK for this forum. I have a device, a modem. I talk to this modem with the linux program "screen" as a terminal program. I invoke it like this "/usr/bin/screen /dev/tty6". I ...
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273 views

cron and lftp issue

I have the following scripts running on raspbian. start #!/bin/bash /root/config/commands 2>&1 > /root/log/$HOSTNAME.log commands #!/bin/bash source /root/config/variables echo TestLine ...