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

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Keeping track of service status continuously

I need to monitor the status of nagios service (Because, whenever I make any changes in configuration and apply the new configuration, I would find nagios service stopped). If found in 'stopped' ...
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50 views

Cron job, random start but within timeframe

I want a script to run once a day, everyday, starting any time between 0900 and 1200. I'm not completely sure about the dash syntax - does it mean that the script will run EVERY hour between 9-12, or ...
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34 views

Cron job running at 12.00 AM despite changing its time

I have only one cron configured in cPanel for WHMCS to run once per day at 12.00 AM. The cron sends daily activity logs to my email. A problem came up recently in which cron job activity logs sent ...
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1answer
80 views

How to restart my java program automatically if it gets killed?

I am running my runnable jar in linux machine (machineA) as shown below. In the runnable Jar, I have a java program which sends email to me every 15 mniutes. ...
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2answers
47 views

Shell script issue when added to cron

I have written a shell script in order to monitor Nagios service status continuously (See this question), which is as follows: #!/bin/bash RCPT="abc@xyz.com" service nagios status | grep [0-9] if ...
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1answer
44 views

SQLPLUS value in variable- not working from crontab

I am trying to store sqlplus value to a variable in Linux. Script is working fine when triggered manually. But value in variable is not stored when the script is called from crontab. Code: ...
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38 views

How do I schedule a cron task to run

I'm looking to crontab a script every hour starting Friday at 5pm... ending Monday at 5am. This script checks if it's completed this week and if it's currently running. If no/no, start task. Off the ...
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3answers
11k views

How can I tell cron to run a command every other day (odd/even)

When configuring cron to run a command every other day using the "Day of Month" field, like so: 1 22 */2 * * COMMAND it runs every time the day of month is odd: 1,3,5,7,9 and so on. How can I ...
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49 views

Why isn't my etc/cron.d file executing?

*/5 * * * * root ruby /opt/redmine/extra/svn/reposman.rb --redmine-host http://tracker.intranet.****.com.ar --scm Mercurial --svn-dir /opt/repos/hg --command "hg init" --owner www-data --url ...
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1answer
23 views

'Is a directory' while trying to pass to destination directory

I've been trying to get my script to work from a cron job so that I can automate a backup of my /home directory, but unfortunately when I run with run-parts to test if the script will work I keep ...
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4answers
31k views

What is the 'working directory' when cron executes a job

I have a script that works when I run it from the command line, but when I schedule it with cron I get errors that it cannot find files or commands. My questions is twofold: When I schedule a cron ...
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2answers
88 views

Why does my cronjob not execute my shell-script?

I have a crontab that creates a dump of my database every night: 20 3 * * * /path/to/dailydump.sh dailydump.sh contains: #!/bin/sh DATENAME=`date +%Y%m%d` ...
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1answer
35 views

Adding timestamp into log file via cronjob command [duplicate]

I try to run git pull command with loging output message to file every 5 minutes. But i got error like this, (root) CMD (cd /var/www/sites/ && git pull origin master | sed -e "s/^/$(date ...
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3answers
18k views

How do I find out why cron is not running my jobs?

I'm using Ubuntu 14.04, and the cron daemon is running: # ps ax | grep cron 822 ? Ss 0:00 cron but it is not executing any jobs. I was previously getting entries in /var/log/syslog such ...
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1answer
44 views

Run an application at each system boot in Arch Linux [duplicate]

I am using Arch Linux. I don't have any special permissions, I am just user without any special privileges. I want to start an application after each boot. I have already tried using crontab jobs, ...
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2answers
1k views

Have cron email output to MAILTO based on exit status

I have a cron job running a php command like this: php /path/to/script.php > dev/null This should send only STDERR output to the MAILTO address. From what I gather the php script is not ...
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1answer
28 views

Disable log of specified crontab item

How can i disable logging for specified item/line in crontab? (i´m on debian/raspbian) I have a script that checks if wlan0 is up every minute, but i don't like that cron logs every minute on syslog ...
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1answer
97 views

how to pass a password with a cron job safely?

I have a site map generator script placed in this URL http://www.mydomain.com/admin/sitemapgen/ However this URL is protected with an username and a password in auth_type basic method. I need to ...
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37 views

terminal linux calendar specify used calendar file

I´m playing around with linux calendar My aim is that all users can run a script which does nothing more than adding a givven argument in 10 days as cal item // called like this: reminder "Meeting ...
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1answer
53 views

Running smsd gnokii on boot

I can successfully run smsd but I could not run it on boot. I tried using rc.local and @reboot cronjob but none of the two worked. Does anyone tried to successfully run the script on boot?
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1answer
278 views

Where to find the Crontab logs in CentOS

First of all I'm using CentOS [root@a etc]# cat system-release CentOS release 6.5 (Final) [root@a cron.daily]# ps -ef | grep cron root 982 1 0 Jun14 ? 00:01:15 crond root ...
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34 views

Strange cron behaviour

I have a script that reads a list of IPs from a file, compares with the existing ones in a chain, and adds recently added IPs in the file into that chain. Running the script manually (e.g., ./script) ...
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24 views

Can I change the exclude file list while running rsync under a cron job

I am using Fedora 20, MATE desktop, zshell. I have started a cronjob to run, every evening, an incremental backup using rsync, closely following the suggestions here. After the first run yesterday, ...
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1answer
21 views

Switching shells for one cron job

Say I have the following in my crontab: * * * * * command1 -option A; command2; command3; etc. I would like cron to run the commands I have in that line with a specific shell. How can I do that? ...
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32 views

Get chronological list of dates & times for scheduled tasks in cron

Given a job specification in crontab, is there any way to get the list of dates and times the job in cron will run in the next week? For example, given a string 10 13 * * *, is there any way to get ...
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41k views

Why did my crontab not trigger?

I used crontab -e to add the following line to my crontab: * * * * * echo hi >> /home/myusername/test Yet, I don't see that the test file is written to. Is this a permission problem, or is ...
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1answer
41 views

Where is NMon cron job for AIX?

While trying to know where is NMon job configured to run; I do find that it's NOT listed on Crontab (using crontab -l). BUT - the job is currently running as expected, which is weird. See the ...
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2answers
58 views

bash script cronjob not working

Why is the cronjob below not working? As manually executed script is working, but if I put it on cron job it doesn't push through. #--------Reports------------- 25 11 * * * ...
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180 views

Issue running Python script via cron inside Docker

I have an official Ubuntu 14.04.1 container running via Docker. cron is working fine, I added * * * * * /bin/echo "working" >> /test to my crontab using crontab -e and then I started cron with ...
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1answer
21 views

SASL authentication fails when called from crontab

When I run mbsync from the command line it works fine. But if mbsync is run from the crontab, mbsync fails with this error "Error: SASL(-1): generic failure:". My guess is that mbsync's SASL ...
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32 views

How do I suppress all email notification from cron for particular job?

I am scheduling the following shell script #!/bin/bash (echo open mailserver.nowhere.local 25; sleep 1; echo EHLO; echo quit)\ | telnet | grep "?Invalid command" if [ $? -eq 1 ]; then ...
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94 views

Cron several script every 5 minutes with 10 second between each script

I have several file setup in my crontab, all those scripts must run every 5 minutes. The problem comes when those script need to much CPU and IO at a time and the machine become unavailable. To ...
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2answers
1k views

Need help with a script to test for memory usage [closed]

I'm trying to put up a temporary band-aid while I work out a solution for a app's memory leak. What I wrote was a small bash script that I put in the root on the server. This is what the script is ...
2
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1answer
42 views

How to suspend a process for a certain period of time?

I have several running processes which is started by a shell, but I don't want them to run during 08:00am - 20:00pm for each day because they are really bandwidth-consuming, so , I have to suspend ...
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41 views

Logrotate or scripting to manipulate log file

I want to make sure that a certain log file gets empty when it reaches a specific size. I first used logrotate since the man page says: It will not modify a log multiple times in one day unless ...
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1answer
52 views

In crontab, @reboot is working but regular not working

I am studying linux on my raspberry pi that installed debian version. There were no problem, worked perfectly in crontab, but something has occured. @reboot sudo bash /home/pi/IP_check.sh */10 ...
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2answers
348 views

systemd - Timer units that mimic anacron behaviour

I need to write a timer unit for a machine which is turned of frequently (e.g. classical desktop setup). This timer unit needs to be activated regularly but not very often (e.g. weekly, monthly). I ...
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1answer
30 views

Killing a process with cron as soon as it starts

I want to stop dropbox from running as soon as I log into my account. Now I know I could do this simply by going to Startup Applications and disabling dropbox. But I was wondering if there is a ...
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29 views

How to monitor the integrity of a script that is running?

I want to make sure a running python script was not modified accidentally by some other process (or cosmic ray, or unexpected developer update). I've heard of comparing a checksum of the script (e.g. ...
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2answers
33 views

Changing user's wallpaper via system crontab

I tried to set up wallpaper change via cron in /etc/crontab, but I failed. DISPLAY env set directly / before cmd, but still it's not working: DISPLAY=:0.0 * * * * * ad env DISPLAY=:0.0 ...
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21 views

How to set one job to run at precise time with anacron without losing config at next upgrade?

I want logrotate to run at a precise time daily. Currently it is set to run at some random time using anacron and I don't want to change the randomness factor for all the other jobs. I have ...
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31 views

How to know the which jobs are scheduled in cron for today

I am looking to get the details of jobs which are scheduled to run from cron for today and need to make it as a script by 12AM every day to get the job details that are scheduled for today and like ...
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2answers
51 views

change the name for root mails from cron

I have two servers that are synchronized with rsync, one is the failover server of the other, so they both have the same name. Now root mails that are sent to my other account are all named from root ...
1
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1answer
318 views

How to run a cron job to execute every minute?

I am trying to create a directory having timestamp in its in name in /home directory. I have created following cron job as root user. But it's not running. What's wrong I am doing? Following is my ...
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2answers
14k views

Cron job to delete files older than 3 days

I need to remove files older than 3 days with a cron job in 3 different directories. (these 3 directories are children of a parent directory /a/b/c/1 & /a/b/c/2 & /a/b/c/3) Can this be done ...
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Why does rbenv not get added to the path when bash -lc is called from a crontab job? [duplicate]

I'm trying to setup a cron job to back up a rails project using the whenever and backup gems. I have done a standard install of rbenv on Ubuntu to manage my rubies. In .bashrc export ...
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1answer
69 views

Shell script runs differently when schedulled with cron

I have a strange problem with my backup script. To begin with, this is the backup script: ########################################################### # CODE BEGINS HERE ...
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3answers
21k views

How to start a cron job without reboot?

I use a cron job to call offlineimap every 2 minutes: */2 * * * * /usr/bin/offlineimap > ~/Maildir/offlineimap.log 2>&1 I needed to kill the cron job to fix a problem. How can I then ...
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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 ...
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1answer
37 views

Edited /etc/cron.d/anacron, changes are immediately in effect?

After editing /etc/cron.d/anacron and saving the file, are the changes immediately acknowledged by cron? Or do I need to run a command to tell cron to reload /etc/cron.d/anacron?