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

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What does `line 19: 12364 Killed` mean in crontab error message?

I got a daily crontab task: 50 1 * * * sh /my_path/daily_task.sh > /tmp/zen_log 2>&1 This daily_task shell script will run some python scripts and produce a data file. And it fails for ...
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101 views

Prevent empty rsync email on cron

I have a crontab job to sync a folder: 50 5 * * * /home/user/bin/sync-folder This will execute an script: #!/bin/bash sudo rsync -rav --delete --log-file=/tmp/rsync-output /origin /destination ...
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911 views

Run crontab only if condition

I have a bash script that emails me whenever a web server is not responding, and the script is ran by cron every 5 minutes. However, if the website goes down for a few hours, I'd receive too many ...
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117 views

Find and rm command not obeying exclude list occassionally

I am running a find and rm -rf directory list modified earlier than 7 days with an exclusion list of directories which should not be deleted at any case. This is the script excerpt find [path-to-...
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203 views

Issue with a script launching URL, then pkill firefox after X seconds with cron job

I am trying to create a shell script that will start firefox on a certain URL, then kill it 120s later. I have a script that mostly works and a bad crontab job that doesnt seem to. testscript.sh: #!/...
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184 views

Crontab only for 24 hours, but every 4 hours

How can I run a crontab for every 4 hours where I download a file from a certain given link but only for 24 hours, starting at midnight? And put the 8 file content in a new file?
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4k views

Cronjob doesn't execute shell script, but when I am executing it standalone it works. Why?

Shell Type: >echo $SHELL /bin/ksh Cronjob : 15 * * * * /bin/ksh /wls_domains/resMGT/logs/bea/wlr3queuetransaction.sh > /wls_domains/resMGT/logs/bea/data/script.log The script is as below: ...
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32 views

Is there a good reason to prevent users from using cron/at?

At work on our linux servers, I have a standard non root account. Unfortunately the account does not have permissions to crontab or at. Is there a good reason to block these commands? I can write a ...
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450 views

Restarting OpenVPN on SELinux by a cronjob

I have a server with some OpenVPN instances (one server, several clients) running on Debian with enforcing SELinux. The connections to some of the VPN servers my machine is connecting to are somewhat ...
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906 views

Crontabbed shell script not able to create/write to a file

I have written a simple shell script to backup the tables in my DB using the mysqldump command. The command simply dumps the DB into a dbName.sql file. However, if the dbName.sql file doesn't already ...
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228 views

How to automaticly open a URL at specific times each day

I am using kubuntu 14.04. I have installed cron using sudo apt-get install cron, and then I created this file in IDLE, called openurl.py. #!/usr/bin/env python import webbrowser webbrowser.open('...
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310 views

init.d script ignored in yocto based distro

I'm modifying an embedded distro that is built using the yocto project. I need to add cron to it and have the cron daemon start on startup. I have created the symlink /etc/rc5.d/S98cronstart that ...
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684 views

Time remaining for the next run

I need to calculate the time remaining for the next run of a specific job in my Cron Schedule, I've a Cron with jobs having frequencies of per hour, thrice a day etc, no jobs running on specific days/...
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286 views

Databases backup with cron

I'm trying to set up a cron job in order to backup my databases daily. Here's what I wrote in my crontab file : 25 18 * * * root mysqldump -u root -p myPassWord --all-databases | gzip > /var/...
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625 views

Turn off mail notification in terminal

I'm running some cron jobs on my machine and every time I fire up a terminal session I'm getting a 'You have mail' message (the job produces output on success which gets mailed to me). Any way to ...
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2k views

Cron Job Not Running

Oracle Linux 5.10 I can manually run the script "tblspc_usage.sh" successfully as the oracle user. I know this because it emails me a report. But it not run at all from cron. It doesn't generate a ...
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886 views

My script is reported as executing at the CRON log, but it is not listed at any user's crontab

This is the CRON log case computer that runs some scripts (internet-connections oriented): luis@Fostrot:~$ sudo tail -n 50 /var/log/syslog | grep "cron" -i Jan 19 21:30:01 Fostrot /USR/SBIN/CRON[...
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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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3k 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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3k 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. /usr/lib/jvm/java-1.7.0-openjdk-amd64/bin/...
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301 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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469 views

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' state,...
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109 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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675 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: #!/bin/...
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Why isn't my etc/cron.d file executing? [duplicate]

*/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 http://...
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112 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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538 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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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` BASENAME="/path/to/dumps/db_${DATENAME}....
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184 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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52 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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2k 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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285 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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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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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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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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65 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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201 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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302 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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230 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 * * * /logs/scripts/chim/...
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678 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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97 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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88 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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1k 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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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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128 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 9-...
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90 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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44 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 cron-...
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181 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
105 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 /usr/bin/...
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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 ...