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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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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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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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 ...
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312 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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233 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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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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458 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 ...
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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
102 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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253 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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121 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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158 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 ...
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238 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
102 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
52 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
103 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
294 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 ...
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884 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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74 views

How to set “Max. Allowed Cronjob types (chrooted and full implies url)” to Full Cron for the ISPConfig admin user?

I'm using ISPConfig with the admin account and created a couple of sites. When I add a cron job the following line is added in the /etc/cron.d/ispc_chrooted_web3: SHELL='/usr/sbin/jk_chrootsh' ...
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1answer
108 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!
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131 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 ...
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2answers
370 views

How to prevent termination of long-running Python script

I have a cron job running a Python script on a VM-based remote Ubuntu server. The script takes a couple hours to run, and I'm noticing the kernel appears to be terminating the script before it ...
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1answer
302 views

Plesk cron iOS notifications randomly stopped working [closed]

Recently, I started getting these cron error from Plesk. This cron controls push notifications to Plesk Manager on my iPhone/iPad. Obviously, turning off the cron stops the error but I want the cron ...
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1answer
54 views

Cronjobs putting archive in wrong directory

I am running a website on an Amazon ec2 instance running the default Debian linux. I set up a cronjob to copy the site files, take a database imprint, and zip them up. I want to keep the file ...
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445 views

how to execute a command on the first, second, third and fourth Sunday of the month with crontab [duplicate]

I have 4 servers and I want each one of them to execute a reboot on Sunday. Server 1 - first Sunday of the month (first week) Server 2 - Second Sunday of the month (2nd week) Server 3 - third Sunday ...
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66 views

what is the meaning of *this* crontab setting?

* */1 * * * sh foo.sh I found this setting on one production machine. And foo.sh was executed every one minute. I am guessing that the original author of this setting wants it to be executed every ...
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2answers
53 views

cron job to archive files older than xyz days [closed]

I would like to archive all of the files older than Xdays. the files are in /home/user1/ and i would like to move the archive to /home/user1/folder_backup/ i am running ubuntu server 12
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112 views

Crontab group permissions

I have noticed on my debian machine that the crontab user does not have read permissions on the /var/spool/cron/crontabs directory. drwx-wx--T 2 root crontab 4096 Jun 20 21:34 crontabs Further more ...
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168 views

Why is this cron job with shell script failing? [duplicate]

I created a cron job to do a daily backup, to store it in the directory /backups This backups directory is located at the root [/] of the VPS server and is a separate backups partition provided by ...
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41 views

Can't locate cron service, how to start it?

# rpm -qa | grep cron crontabs-1.10-5.noarch I have the above version of cron installed on my RHEL 6 server. My crontabs commands aren't reconginzed: # crontabs -l -bash: crontabs: command not ...
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387 views

script PHP doesn't work in crontab [duplicate]

Good morning, I have into my ubunut server a script that check into a database some value and if the condition is true send some email. If I launch into the browser the script like: ...
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1answer
25 views

cronjob every sunday of the week [duplicate]

Hi all I have an ubuntu server where I want to create a cron every sunday al 23:00 I have read manual and I have try to use some cron generator. I have tried in this mode: 0 23 * * * root test.php ...
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1answer
40 views

Setting up a new job using ubuntu's crontab [duplicate]

I have little experience with setting up cron jobs. I need to configure a cron job to delete all files starting with the filename 'sess_' from the '/tmp' folder every hour. If I fire up the crontab ...
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67 views

Cron job: stdout to /var/log, stderr to email

I have a cron job that is running every hour, and providing output (over stdout) similar to the following: Found 1 batch jobs {'job': 'update'} Job 1 started at 2013-06-07 13:00:03.673683+00:00 ...
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1answer
395 views

ESXi 5.0 can't parse crontab (ghettoVCB) [duplicate]

I'm trying to run ghettoVCB via cron on a ESXi 5.0 Machine. This is the command (add some linebreaks for better readability) /vmfs/volumes/VMs\ Pool/ghettoVCB-master/ghettoVCB.sh -f ...
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651 views

Cron job in webmin

I have a webmin on Centos server. I want to create custom cron job. However there is cron job setting options available under "Scheduled Cron Jobs" tab. But if I want to set weekly cron then there it ...
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64 views

Cron and FTP daemons crashing randomly in RHEL

Not sure where to start in troubleshooting this. I'm not finding anything indicating an issue in ProFTP logs or in /var/log/messages. So I do apologize for not having more information to give. ...
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57 views

crontab in different sessions

I started a crontab job in a server remotely (in a screen session) from a local machine. Days later, I terminated the screen session and restarted my local machine. The cron job in the server is still ...
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201 views

Cron expression that runs every 5 minutes from 1:30 am - 6:00 am [duplicate]

I'm looking to run a job at these very specific times. Can this even be done in one expression?
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93 views

Why doesn't this cron behave the same way when run from CLI?

I have this cron for user root (obtained with crontab -l): 20 10,14 * * 1-5 /usr/sbin/puppetd --onetime --no-daemonize --logdest syslog > /dev/null 2>&1 When it is run, it is supposed to ...
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2answers
245 views

mysqldump in cron not working [duplicate]

I am trying to do a mysqldump on the cron for every 5 minutes but it seems that it is not working. I try to execute the mysqldump and it works fine. mysqldump mysqldump -uroot -ppassword ...
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2answers
130 views

Which user should cron jobs run as?

Ubuntu server with users root www-data mywebsite1 mywebsite2 There are multiple websites hosted on this server, each with their own user. Each website has their own cron jobs mostly ...
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136 views

Read-only cronjobs for users

Here's a weird issue. I want to make crontab for a user that is read-only for that particular user and can only be managed via root. Sounds easy? Here's the catch: $ ls -alh /var/spool/cron/my_user ...
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Ubuntu Server scheduleing a cron job not working

I am trying to schedule a cronjob on my ubuntu server through SSL. I ran the command: sudo crontab -e Then once it created a new file for my user, I put : * * * * * php /etc/php5/apache2/php.ini ...
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1answer
62 views

schedule a job to run only “once” after 50 seconds

I have a process which is designed to do a specific task in case of events. Requirement is to run a specific command 50 seconds after an event occurs. Cannot modify the code to put sleep there as it ...
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2answers
1k views

how to execute bash script with crontab in centos? [duplicate]

My bash file is not executed by cronjob created as root. The cronjob setup looks as it follows 0 0 * * * mysql_backup.sh does need to be decalared with the bash command 0 0 * * * bash ...
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507 views

centos cron logs are not executed

I have been trying to setup a cronjob on centos but doesn't seems to work. I have been deleting the crons logfile to see all newly created logs and I have been restarting crond but /var/log/conf ...
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1answer
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How do I make cron run every other Sunday on the OTHER Sunday?

I have a cron job that runs at 0 0 * * 0/2 -- i.e. every other Sunday. It just ran now, for instance. However, I want it to run on the other Sundays -- next Sunday, rather than this one. Another ...
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1answer
67 views

No way to make a specific cronjob work [duplicate]

I installed nginxcp on my server and they recommend to add the following cron: 0 */1 * * * /usr/sbin/tmpwatch -am 1 /tmp/nginx_client I already added it to var/spool/cron and restarted crond ...
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253 views

Review of a crontab script to add timestamps to minutely runs; any suggestions?

I've got a crontab job set to run minutely as such: * * * * * /home/username/public_html/domain.tld/production/scripts/cron_runner.sh My goal is to add some timestamps to output from cron so I can ...