Cron is a job scheduler that allows users to run commands periodically.

learn more… | top users | synonyms (1)

1
vote
0answers
480 views

Cron job scheduled to run on specific day-of-week is running on last day of month as well

I have a cron job scheduled to run every Thursday at 6am via the following schedule: 0 6 * * 4 It's been running as expected, but on Tues, September 30th it ran (unexpectedly) and again on Thursday,...
1
vote
3answers
75 views

Where is this cronjob running?

We have a news server running on a CentOS 6.5 box. It's leafnode, and a cron is set to run every two minutes. We decide to shut it down to troubleshoot other issues, so we comment out the line in ...
2
votes
1answer
306 views

To write this Pseudocode with Regex

I am doing a Makefile which I run regularly by Crontab every day at 0230 crontab -e; 30 2 * * * /bin/thePseudocode Python-like Pseudocode directories = ["Cardiology", "Rheumatology", "Surgery"] ...
0
votes
1answer
145 views

Cron, crontab -e reads the wrong file

I do a simple: crontab -e In the top of this file, I have: #DO NOT EDIT THIS FILE - edit the master and reinstall. And I see that it has opened up some temporary file under /tmp I am using ...
2
votes
2answers
282 views

Cron job not behaving as expected

So I have a python script that pulls down git/svn/p4 repositories and does some writing to a database. I'm simply trying to automate the running of this script and based from what I see in syslog it ...
1
vote
2answers
974 views

cron will find certain commands on the PATH but not others

Having issues making crontab run certain commands, despite the PATH and SHELL being set correctly. Here is the env of the machine: SHELL=/bin/bash USER=ubuntu MAIL=/var/mail/ubuntu PATH=/usr/local/...
3
votes
3answers
6k views

Cron job to check if PHP script is running, if not then run

I am wondering if someone might point me in the right direction. I've got little experience working with the Linux command line and recently due to various factors in work I've been required to gain ...
1
vote
1answer
79 views

Need to automate the updating of the crontab file

We have an automated process where a server is built, and after applications/middleware are installed using another automated process, and the crontab needs to be updated for those applications/...
3
votes
2answers
2k views

Do spaces matter in a crontab

It's not clear to be from the manpage for crontab. IS extra white space allowed between the fields? e.g., if I have this: 1 7 * * * /scripts/foo 5 17 * * 6 /script/bar 31 6 * * 0 /scripts/bofh is ...
1
vote
0answers
175 views

Maintain screen session when executing shell script on boot

Solved: I solved this problem by introducing a delay before executing the script: @reboot sleep 60; /root/start_server.sh On Ubuntu 14.04, I have a crontab entry set to run on reboot: @reboot /...
1
vote
1answer
75 views

High precision scheduler daemon

I'm looking for a scheduler daemon like cron, but with at least seconds precision so I can use it for a radio automation app. I've heard conflicting rumors about cron's ability to handle seconds. If ...
1
vote
1answer
104 views

Why can I not source a file with the default cron installed on a debian wheezy server? [closed]

I use cron for years now. In order to load all my environment variables at once, I define them in a dedicated file (often but not always .bashrc) that I source in the crontab: * * * * * (. /home/me/...
0
votes
1answer
488 views

How do I do “Hello World” to try using cron

I am using Fedora 20, and want, eventually, to set up automatic backups. I managed a trial run on my previous Fedora 12 installation, but can't get started again. I am using zshell. I thought I would ...
0
votes
1answer
68 views

Why is there an apt-get script set in my cron.daily, I'm on Fedora 20?

I found this file tonight: /etc/cron.daily/apt.cron #!/bin/sh [ ! -f /var/lock/subsys/apt ] && exit 0 [ -f /etc/sysconfig/apt ] && . /etc/sysconfig/apt [ $CHECK_ONLY == "yes" ] &...
2
votes
2answers
1k views

How to make my bash script be able to create an log file for a clamscan running in cron?

I've created an custom clamscan(clamav) in bash and when I run it in my shell everyhing is fine, but if I run it in a cron, it can't create the log file. This are the errors: /root/Scripts/...
0
votes
2answers
2k views

Cron job to check if PHP script is running

I am having trouble regarding Cron jobs, I've basically got two PHP scripts that I want to keep running continuously on my server. Currently I am using an infinte loop to keep them going but they seem ...
0
votes
1answer
2k views

openSuse, not running the cron job

I have created a cron job in the /etc/cron.d/dispatchingEmail_I the permissions of dispatchingEmail_I are the following: -rw-r--r-- 1 root root 84 Sep 11 19:52 dispatchingEmail_I content of ...
2
votes
1answer
2k views

Unable to install crontab on OpenSuse

I am running the following command as root, on OpenSuse: linux-gn77-PC:/home/harbir/project # crontab -e when the editor opens up I type the following, as I want the command to be run at 2145 hours ...
1
vote
3answers
9k views

Using nohup to keep a script running indefinitely

I am very new to Linux and I've only been using it to SSH to my web server using Putty. The issue I am having is this: Basically I've got 2 php scripts. One get_tweets.php constantly listens for ...
2
votes
1answer
44 views

Incorrect cron for midnight?

I checked the crontab set by the hosting company and they have this: 0 * * * * /usr/bin/php /www/sites/[domain.com]/files/html/shell/indexer.php reindexall Does this cron run constantly or once at ...
1
vote
1answer
308 views

Execute All Cronjobs in ~/.zshenv Environment

I want to execute all cronjobs in the environment defined in my ~/.zshenv, and I want to redirect STDOUT and STDERR of every cronjob to a single log file. I am on OS X 10.9. What is the cleanest way ...
2
votes
1answer
196 views

Qt program not invoked by cron

I had a simple Qt program, when running, it shows a simple window with a countdown timer. If you might be interested in the code, please see here. I had crontab line * * * * * /home/my-user-name/...
0
votes
1answer
105 views

How to create CronJob for running commands on reboot?

Via my host I have SSH access and a control panel. I installed Rails via SSH on a light weight server. I want to reboot the server when it goes down. I think I need to start it manually since I want ...
2
votes
1answer
57 views

Send cron mails to root bundled every hour

Sometimes when there's a problem on my server, I get hundreds of emails in my root account which are caused by cron. I want to be notified about those problems but isn't there a way to bundle those ...
2
votes
1answer
608 views

How can I periodically check if my network is up and reconnect if not?

I've written a script to periodically check whether my network is up by pinging three major sites and disconnecting and then reconnecting my network if all three fail. This script works fine from the ...
0
votes
1answer
450 views

Run screen command with variable & tick through cron (cron run .sh)

I run screen command through cron, where the codes is in lorem.sh files. This is cron codes: * * * * * cd /home/z; ./lorem.sh Inside lorem.sh: screen -S screenname -X stuff $'\033[B' sleep 1 &&...
0
votes
1answer
434 views

crontab entry for a command to run every week and three months?

What would be my crontab entry for a command which I want to run every week. I don't want to run any command between 8 PM till 5 AM and any random day is fine. Similarly what would be my crontab ...
2
votes
2answers
643 views

Can I configure error notifications on a specific cronjob entry to go to a different email address?

I have multiple cron job entries configured under a single account: 0 0 * * * /foo/foo.sh 0 2 * * * /foo/foo2.sh 0 4 * * * /foo/foo3.sh Right now, if any of these encounter an error, an email is ...
2
votes
1answer
692 views

How can I pass a filename containing percent signs (%) as a parameter to a shell script in cron? [duplicate]

We have currently setup a cron job for our new script as below: 46 22 * * * /gzm_common/diagbat9/global/prod/chgstatus.sh /backups/diagbat9/Demantra/output/SK_ITEM_EXTRACT_MFGPRO_$(date +%m%d%y).txt ...
0
votes
2answers
376 views

confuse about User:Group what is the best for /var/www, and Crontab user?

I'm new on linux server. I have 2 question that I'm confuse about this. 1 1. user:group now I chown my /var/www/html like this. my nginx.conf is set server{ user www-data } and in terminal I set ...
0
votes
2answers
311 views

How to set cron job for system

I'm really new on Linux and have no any previous experience on it. And I opened this account to ask this question. I need to install a cron job I've followed the short guide here. Well, I think it ...
1
vote
1answer
2k views

Reboot when no network connection does not work!

I have a Raspberry Pi that I use as a NAS for my local network. It works fine, but when I turn off the router to which the pi is connected, it permanently loses the connection. To be able to connect ...
1
vote
3answers
12k views

crontab error with (No MTA installed) but I use >/dev/null 2>&1

I'm new on linux user I try to run crontab to backup my database with vagrant user * * * * * /usr/bin/mysqldump -h localhost -u root -p root mydb | gzip > /var/backup/all/database_`date +%Y-%m-%...
1
vote
0answers
657 views

systemctl to start cron-like job

In /etc/systemd/system directory I have: rsnapshot-backup.service file, with following content: [Unit] Description=rsnapshot backup automation [cron like] [Service] Nice=19 IOSchedulingClass=2 ...
0
votes
1answer
500 views

How to start a cron task?

It sounds really simple, but many times I was stuck at the beginning of learning a new command. The tutorial writer think it's natural to start, but it's not. This is the tutorial I've been reading: ...
0
votes
1answer
1k views

What should be the security context of these cron files?

I am running Fedora 20 and I am having some issues when running logrotate and anacron which I suspect may be related to SELinux: Failed to determine timestamp: Cannot assign requested address chgrp: ...
16
votes
3answers
2k views

How can I start a cronjob 1 hour later each day?

I need to start a cronjob every day, but an hour later each day. What I have so far works for the most part, except for 1 day of the year: 0 0 * * * sleep $((3600 * (10#$(date +\%j) \% 24))) &&...
0
votes
1answer
3k views

Restarting process via cron every 12 hours

I'm not familiar with cron at all, and I've looked it up and am still confused as to how specifically it works. I'm on CentOS 6.5, and I need to end a process and then start it again every 12 hours. ...
3
votes
2answers
9k views

how to set crontab PATH variable

I had a problem running a script from crontab. After some research I understood the problem was because PATH parameter doesn't include /sbin. I looked what it does include in /etc/crontab: PATH=/...
2
votes
2answers
2k views

Cannot edit crontab as non root user

When I use the command crontab -e on my Debian server as a non root user (in this case as postgres), I can't edit it because of "/tmp/crontab.SJlY0Y/crontab" [Permission Denied] crontab -l on the ...
0
votes
2answers
177 views

`cron` service and `at` command

Help to understand: is there any relation between cron and at command. Actually if I stop the cron services in SUSE by running following command: /etc/init.d/cron stop after above, if I run at ...
4
votes
2answers
900 views

Create new temporary directory

What's an effective way of creating a new /tmp directory, that behaves just like /tmp (purged on reboot, etc.), but in a different location? In my case, I want to create a ~/dev/tmp directory where I ...
3
votes
2answers
21k views

How to kill a process in shell script which is running through cron?

I have a shell script which runs in cronjob. This shell script has to kill a process which is running and start the new process again. When I run the script manually it works perfectly fine, but when ...
-2
votes
1answer
56 views

Run job at boot and on a schedule from same crontab

I have a process that I need to run on boot and periodically. I've created a file for it in /etc/cron.d/. Is there a way for me to specify that I want @reboot 0,30 * * * *?
4
votes
2answers
1k views

Schedule job at irregular intervals

It's simple enough to use cron to schedule a job to occur periodically. I'd like to have something occur less regularly -- say, run the job, then wait 2 to 12 hours before trying again. (Any ...
1
vote
0answers
28 views

How to find out why my cron didn't run? [duplicate]

This is the content of root's crontab: 0 23 * * 0-4 /usr/sbin/rtcwake -time `date --date="+16 hours" +"%s"` -m mem This is set to fire off that command every Sun-Thu at ...
1
vote
1answer
6k views

bash script not being run by cron [duplicate]

I have a very simple bash script that runs flawlessly when I do ./removeOldBackup.sh or sh /home/myusername/backup/removeOldBackup.sh but when I add it to crontab like * * * * * sh /home/...
5
votes
3answers
2k views

Cronjob to run script every 3 weeks on Wednesday

Is it possible to schedule a cron job that would run every three weeks on Wednesday (8AM) only? Or, if that is not possible, to run a job every 27 days or less but on Wednesday at 8AM.
1
vote
1answer
1k views

Why doesn't my supervisor daemon start on reboot?

I have added a crontab entry via crontab -e for the current user: @reboot supervisord -c /etc/supervisord.conf Yet after the reboot, supervisord demon is not running. I need to run the command ...
1
vote
2answers
146 views

How to determine the newly closed file within a continuous audit log rotation?

I am attempting to find the best way to determine when the second file (of a matching criteria) is created. The context is an audit log rotation. Given a directory where audit logs are created every ...