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

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Add cron job via single command [duplicate]

First of all, I'm using elementary OS (based on Ubuntu 12.04). I have a cron job set up to run a script every day at 23:30: 30 23 * * * /path_to_script/ Is there a way to add it to cron via a ...
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73 views

Why scripts run as user but not as a cron?

I have a script that checks to see if port 4000 is open and listening, if it is return true, else start a service that also outputs a logfile. The script runs fine if I execute it as a user, but if I ...
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84 views

I would like to delete entire archive log except retain last generated archive log

I want to delete all the archivelog, But retain last generated archive log alone. Currently I am using following which will delete entire/all the archive log and clear the directory itself. find . ...
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24 views

Pngquant does not run in Crontab

I have created a small script to compress all the images using pngquant. The script is as follows: #!/bin/bash find /home/ghosthut/wp-content/uploads -mtime -2 -iname '*.png' -print0 | xargs -0 ...
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138 views

Not able to run shell script using cron [closed]

I have a shell script test.sh in /home/username The test.sh file contains the following lines - #!/bin/sh cd /home/username/bin sh launch.sh ParameterName #launch.sh is in /home/username/bin ...
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3answers
136 views

CronTab is not working in Ubuntu for image compression job [duplicate]

I am trying to set up a cronjob to execute the following script. The function of the script is to find and compress png and jpg files in a WordPress directory. #!/bin/bash echo `date` >> ...
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1answer
32 views

Why does apt-get remove leave package-installed cron files lying around?

Is there a good reason why apt-get remove leaves installed cron files in place where an apt-get purge or apt-get remove --purge is actually required to completely remove them? Example files may be: ...
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64 views

Cronjob schedule

I have a task which I wanted it to run on every hour 56 minutes not sure which I should do below and what does "*/number" means. An example :- 12:56PM, 01:56PM, 02:56PM ... Use this ? */56 * * * * ...
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223 views

Cron can't access my home directory when I'm logged out

I have quite a strange problem using cron. I distilled it thus far: I created following simple bash script in /home/user1/cron_dir/cron.sh: #!/bin/bash echo "Success" As user1 I created following ...
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2answers
98 views

Why is cron ignoring a / (forward slash) interval?

I want to set up a job to run every 15 minutes, starting at the 5th minute. This is my crontab line: 5/15 * * * * /root/job.sh >> /root/job.log But it only runs once an hour, on the fifth ...
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30 views

Is there any way to maintain counts in crontab?

Need to keep a track of the succeded jobs, on daily basis, with jobs ranging from /10 /20 minutes to twice/thrice a day, least for these every 10/20 minutes runs, I'd be interested to know if there ...
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What does CRON=1 do?

What does setting CRON=1 do when set in front of a command? CRON=1 ./foobar.sh I suspect that the cron environment variable does something for printing to standard out. But I can't find anything ...
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144 views

Display cron job times in a human-friendly format

Is there a way to display or is there a tool that can parse a crontab expression and display it in a human-friendly way? 10 6 * * * sh /usr/local/crons/file_check.sh For example, for the above cron ...
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1answer
70 views

Remove tar compress spool from cron email

I have a crontab job that call a simple script to backup a website: 15 0 1,10,20 * * /home/username/bin/backup_whatever This is the script: #!/bin/bash TODAY=$(date +"%Y%m%d") ...
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409 views

BashScript works from Terminal but not from CronTab

I've got a bunch of CronJobs, and they work fine, except for one. I've looked through a lot of forums and websites, and tried a combination of things but alas nothing has worked. Rephrasing the ...
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105 views

How can I run Cron job every 5 days

I have 5 shell scripts, I want to run them in 5 days cycle, like follows: Day 1 : script 1 Day 2 : script 2 Day 3 : script 3 Day 4 : script 4 Day 5 : script 5 Day 6 : script 1 ...
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211 views

cronjob bash script called within another shell script not working

I have a shell script which calls a bash script within it. when I run this shell script manually it works fine however when I schedule this thru cronjob, the bash script is not doing the intended job. ...
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333 views

auto restart apache when high load average

My server always shut down when it reach a high load average. I have optimized my apache, mysql. but i cannot prevent sometime in a heavy traffic. So I try to write some shell to control load average. ...
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173 views

Entries in /etc/crontab not getting called in Centos 6.x

I created a dummy entry in /etc/crontab, but it doesn't get executed according to the cron log: /var/log/cron: Feb 7 08:20:01 localhost CROND[22781]: (root) CMD (/usr/lib64/sa/sa1 1 1) Feb 7 ...
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251 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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664 views

command to clean up old log files

I was trying to automate some auto cleaning of my Ubuntu System, with Cron Jobs I tryed to simplify this: sudo find /var/log -type f -name "*.1.gz" -delete sudo find /var/log -type f -name "*.2.gz" ...
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60 views

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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2answers
6k views

cronjob for automatic DB backup to date prefixed file

I am using the latest Linux Mint. I was wondering if it's possible to create a special cronjob for a database backup. In my /etc/cronjob file I have the following code: # Minute Hour Day of ...
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47 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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64 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 ...
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260 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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113 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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77 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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314 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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31 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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4k 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: ...
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257 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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70 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 ...
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170 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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1answer
125 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 ...
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140 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 > ...
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133 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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550 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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2k views

Trying to create a cron to Rsync then tar the folder

I'm stuck at the first hurdle! I want to run a couple of commands from a bash script. First something like this to rsync some directories: rsync -e ssh -az user-whatever@website.com:/home ...
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213 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 ...
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170 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' ...
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1answer
660 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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66 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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109 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
178 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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60 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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14k 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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216 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
45 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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43k 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 ...