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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To change the output file name of the cron

I am using below cron to generate the logfile with name syntax as "AS_XYZMSCa_VLR DUMP_20150213" I wanted the output file with name syntax as "AS_MSCa_VLR DUMP_20150213" X,Y,Z,a - variables #! ...
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User cannot access crontab

Oracle Linux 5.10 Root user can access crontrab, but not any other user. There is no /etc/cron.allow and the /etc/cron.deny is an empty file. Using Oracle user account: [oracle@dub-ImrORA2 ~]$ ...
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35 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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26 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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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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Not able to run shell script using cron [on hold]

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
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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
20 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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51 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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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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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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28 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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36 views

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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34 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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2answers
595 views

Use /etc/aliases for outgoing mail relayed by postfix with local domain

I'm using Ubuntu 12.04 with postfix configured as satellite system that relays outgoing mail to Gmail. For sake of example, my registered domain is example.com I want root cronjobs' error output to be ...
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1answer
37 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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111 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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43 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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105 views

mail: cannot send message: process exited with a non-zero status

I've had a cronjob working for about a fortnight without any problems. Then last night I checked I didn't get the email that I usually get. I went to the terminal to try send myself an email, I got ...
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2k views

Recover cron jobs accidently removed with crontab -r

I entered crontab -r instead of crontab -e and all my cron jobs have been removed. What is the best way (or is there one) to recover those jobs?
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38 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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41 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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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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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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50 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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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
3k 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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20 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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2answers
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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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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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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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51 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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crontab -e , then 0 * * * * = every hour; then xclock

After sudo crontab -e (it wrote "/tmp/crontab.XXXX70pN9h" 1L, 19C 1,1 All Then I saved the file. And to check..? (how? i don't know) And to check I ps -e | grep cron 29818 ? ...
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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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28 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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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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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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682 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 ...
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416 views

how to automatically cleanup failed PHP uploads in /tmp?

How can I automatically cleanup failed uploads? PHP is storing them in /tmp and all file names look like phpAbCDeF (basically php followed by 6 characters). I know that I can use the command: find ...
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26 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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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
37 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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61 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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32 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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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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1k 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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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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68 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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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 ...