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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How do I rotate old log files to long-term backup?

I have logrotate set up to archive logs for 30 days; how do I set up my cron job to rotate them automatically from /var/log/net to the long-term storage I have mounted on /mnt/backup? I do not need ...
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3answers
546 views

Why cd does not change current directory in crontab?

In my user's crontab, on a CentOS system, I have something like this: 58 12 * * * cd /home/joe/dev; echo `pwd` | logger This outputs in /var/log/messages: Feb 19 12:58:01 srv01 joe: /home/joe ...
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2answers
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cron daemon forking multiple processes and running jobs multiple times

I'm running a bunch of cron jobs (set up using sudo crontab -e) on Ubuntu, and recently (though I don't know when to be sure) I'm suddenly seeing the same jobs appear to be run multiple times in the ...
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1answer
47 views

crontab grep function execution [duplicate]

When I tried exection grep function in particular directory its working on that directory but when I am trying to execute using absolute paths grep is not working for example grep `date +%Y-%m-%d` ...
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2answers
117 views

/etc/crontab file not executed

I created a dummy entry in /etc/crontab, but it doesn't get executed according to cron log /var/log/cron: Feb 7 08:20:01 localhost CROND[22781]: (root) CMD (/usr/lib64/sa/sa1 1 1) Feb 7 08:30:01 ...
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1answer
50 views

CSF not adding IPs to deny file as a cron during high loads

I'm running a cron every minute to thwart brute-force attacks. awk '{print $2}' < ipkill.txt | while read ip; do #query geographical info IP address curl -o country.txt ipinfo.io/$ip ...
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1answer
1k views

CRON expression for firing a scheduled job between two hours including last one

I have a job scheduled via Quartz and a CRON Expression. The goal of my CRON expression is to run every 10 minutes every day between Monday and Friday between 08:00 AM and 20:00 PM and looks like ...
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3answers
614 views

munin-cron Unable to Copy Contents

I recently installed munin on my (Fedora12 based) server. Now, I wanted to get all the graphs in a static directory (The application runs on Django). So, I edited the file /etc/munin/munin.conf by ...
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1answer
983 views

amavis cronjob throwing an error out of nowhere

Can someone explain why amavis cronjob is suddenly trowing the following error? Cron <amavis@bee> test -e /usr/sbin/amavisd-new-cronjob && /usr/sbin/amavisd-new-cronjob sa-sync rules: ...
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1answer
199 views

Cron job as root need to sudo to another user [duplicate]

RHEL6 In root's crontab a have: * 21 * * * /root/script.sh In script.sh there is a line: /usr/bin/sudo -u jira bash -c 'cd /opt/jira/bin; ./stop-jira.sh' && echo "Jira Shut Down" >> ...
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1answer
249 views

Cron job is not working in centos 6.6

I have dedicated server having centos 6.6 and centos webpanel. Now I'm trying to set cron job from centos web panel. I had tried so many commands to run one php file each and every minute, but still ...
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25 views

why is cron flooding wtmp and last?

When I type the last command, I see a bunch of entries in there for cron. Every single cron job that gets run creates an entry and it's flooding wtmp with unnecessary entries. Any ideas how I can stop ...
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1answer
41 views

How to use .profile alias in crontab [duplicate]

I've read the answers to this question, but still don't understand what to do: How to use my aliases in my crontab? I am logged onto my Ubuntu server as root. I have the following command in my ...
74
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9answers
82k views

When does `cron.daily` run?

When do entries in cron.daily (and .weekly and .hourly) run, and is it configurable? I haven't found a definitive answer to this, and am hoping there is one. I'm running RHEL5 and CentOS 4, but for ...
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3answers
266 views

Linux Cron: Can I displace the runtime by “x” minutes?

NOTE: I'm a big newbie when it comes to *nix. I have a cron configuration that runs several programs. Most of them run once a day, and they're set at different times (2AM, 3AM, 4AM, etc) so they ...
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0answers
34 views

Using placeholders or environment variables in sudoers

Is it possible to use in sudoers rules any kind of placeholders (not just wildcards) or environment variables? What I would like to do is to verify that user (the one sudoing a command) passes as an ...
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1answer
54 views

Kill old php cron script

After running ps aux | grep php, I found about 10 php scripts ran by cron that have started over a week ago and are hanging. Each script usually take 40 seconds to complete. I have set ...
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2answers
154 views

Crontab: Authentication token expired; new one is required

I have a crontab job running daily as a non-root user job. Unfortunately it did stop working with the following message (in /var/log/syslog): CRON[29256]: Authentication token is no longer valid; new ...
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2answers
54 views

Creating a log file inside a script works when manually run, but not when run through cron

I'm using Percona's Xtrabackup tools to back up a database nightly. I wrote a wrapper script to keep the proper number of backups around, write the output to a log file, and email the log file if the ...
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1answer
33 views

How to do SSH authentication and CVS update automatically from cron job?

I call a script from cron job. In the script it needs to run CVS commands to update from a remote repository. To do that, it needs to SSH authenticate. I put the following code in the script ... ...
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1answer
51 views

makewhatis and logrotate cron job schedule

In /etc/cron.daily/, logrotate* makewhatis.cron* I understand that above are daily cron jobs. How to display the time set for logrotate and makewhatis.cron? Its not listed when I tried this ...
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5answers
2k views

Minutely cron, ensuring only a single instance

Is there a way to run a script every minute (or 2, or 5, etc), but only if it isn't already running? We have a set of scripts that need to run every minute. Sometimes they might start and finish in a ...
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1answer
72 views

124 emails sent at once while one should be sent every five minutes by cron if a certain web service stops running

So I set up a simple script to send an email alert when a certain web service stops running. It has a simple flow of: test = $( curl [address] | grep [a certain string in response] | wc -l ) if [ ...
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2answers
3k views

What does -q and -O mean?

What does -q and -O mean in the following cronjob? */30 * * * * /usr/bin/wget -q -O /dev/null http://example.com/moodle/admin/cron.php Thanks in advance.
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4answers
8k views

Change default crontab editor to nano in FreeBSD

When I edit the crontab using crontab -e it opens the crontab in vi. I'd prefer it to use nano. How can I change this? EDIT: For some reason the export command returns command not found. And ...
3
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1answer
238 views

How to schedule a Cron job for the second to the last day of each month

I want to schedule a task for the second to the last day of each month. I have read this great article about shell scripting the execution. I have also seen that you can use "L" to represent the last ...
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4answers
4k views

Command does not execute in crontab while command itself works just fine

I have this script from Colin Johnson on Github - https://github.com/colinbjohnson/aws-missing-tools/tree/master/ec2-automate-backup It seems great. I have modified it to send email to myself every ...
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6answers
7k views

crontab environment

I have written various scripts to launch Java server applications, which are typically run for 24 hours before being shut down (by invoking the same script with a different parameter). The script ...
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3answers
2k views

APT FATAL -> Failed to fork

I saw a lot of questions regarding this, but mine seems a little different. Here's what I receive: /etc/cron.weekly/apt-xapian-index: FATAL -> Failed to fork. run-parts: ...
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1answer
42 views

Do cron and atd run jobs with the same user, permissions and environment?

What's the difference between running a bash script via cron and running the script via atd? Is there any difference? Is it specific to the distro? If so, what about SLES 11?
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593 views

Is there a way to restart automatically the HHVM service if I get a '502 Bad Gateway Error'?

I've reported the error on stackoverflow - from time to time my Nginx/PageSpeed+HHVM+MariaDB+WordPress blog stops working. There is some problem with the HHVM service that I don't locate, and I'm ...
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2answers
356 views

Start Tomcat through cronjob

To make sure that Tomcat is running all the time, I wrote the following shell script #!/bin/bash status="$(curl -s http://www.domain.com/check)" if [ "$status" != "OK" ] then ...
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1answer
60 views

How can I tell a script is running under cron?

Is there a standard way to know if a shell script is running under cron as opposed to running from the command line. i.e. I'm thinking of running with more verbose output when manually kicked from the ...
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2answers
78 views

Do i need to restart after editing anacrontab?

To help trouble shoot a few servers, I have edited the delay time in anacrontab. Do I need to restart anything for these changes to be applied? Thanks
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3answers
975 views

How can I get the cron daemon to send me email when a job fails with an error?

I have a few Ubuntu boxes that run various cron jobs daily. As far as I know, there is no postfix or sendmail installed. What's the easiest and/or best way to get cron to send me an email when one of ...
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4answers
712 views

How do you monitor and react when some scheduled job fails? - general question

In many projects my team faced problems with 'silent fails' of some important components. There are lot of tasks executed behind the scenes and if somethings fails (either by errors in logic or ...
0
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1answer
53 views

Wal-E cron job not executing

I have a cron job setup that is suppose to be running the wal-e backup-push command. The command works fine if manually ran through the command line. As the postgres user of course. So I setup a cron ...
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2answers
61 views

cronjob not running daily

I am a linux newbie. With that said I need a cronjob to compress some syslog files after 48 hours to keep the size manageable. These files are currently located in /syslog - a disk I added to handle ...
1
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1answer
60 views

WP-CLI doesn't run from cronjob

I made a bash script that uses WP-CLI and was intended to run from a cronjob. It runs fine from SSH, but fails when run through cron. During debugging I discovered that it was the WP-CLI part that ...
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1answer
156 views

Crontab - I have two cron jobs but only one works [closed]

I use ubuntu 14.04 LTS. I have created 2 cron jobs but only one works. The 2 different website building with drupal cms. */5 * * * * curl -s ...
4
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2answers
474 views

Weird syslog order

Have you ever seen wrong order in /var/log/syslog ? I think that it causes only crontab. Jun 28 22:20:01 alex CRON[2327]: (root) CMD (something > /dev/null) Jun 28 22:21:01 alex CRON[2700]: (root) ...
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1answer
47 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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9answers
47k views

Running a cron job manually and immediately

(I have already read How can I test a new cron script ?.) I have a specific problem (cron job doesn't appear to run, or run properly), but the issue is general: I'd like to debug scripts that are ...
1
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2answers
728 views

How to configure apticron to just report security / critical updates?

We're going to try out apticron, but we don't want to know about every package that could be updated -- only the security / critical updates. How do we configure apticron to do this? PS -- yes, we ...
0
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2answers
82 views

Odd Crontab Service SMB Restart Issue

System: Debian Wheezy x86_64 Service: Samaba So when i'm in a terminal i can use service samba restart or /etc/init.d/samba restart to restart the service. When I create a cronjob and do ...
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0answers
29 views

cron job time managment

I have cron job A and B (both jobs run every minute) from 9.00AM to 6.00PM I like to make the second one run after the first one in 30 second.both cron job should be run by root user. for example if ...
12
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4answers
8k views

Is there a way to validate /etc/crontab’s format?

I prefer to stick scheduled tasks in /etc/crontab so I can see at a glance what's scheduled to run, regardless of which user the task runs as. The only gotcha is that the format isn't validated on ...
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2answers
77 views

Cronjob in cPanel [closed]

I'd like to schedule a cronjob on my server to backup the entire public_html directory daily. I am logged into cPanel and I am on the Cron Job page where I have it set to run this command everyday at ...
1
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1answer
190 views

OpenShift cron does not run

I have the following file [subdomain.rhcloud.com minutely]\> pwd /var/lib/openshift/username/app-root/repo/.openshift/cron/minutely [subdomain.rhcloud.com minutely]\> ls -lha total 4.0K ...
3
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1answer
239 views

Cron Daemon Wget blocked

I've got Nginx on Debian 7 without cpanel. I am seting-up my Crontab like this: */45 * * * * wget "http://example.com/cron-url.php" >/dev/null 2>&1 The above cron is being blocked with ...