Cron is used to execute scheduled commands. It acts as a task scheduler on Linux and UNIX systems which will execute commands at specified times set by the user. Cron has a great deal of customization and is often used on server environments where common tasks are run on a regular basis.

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Scheduling shutdown in layman's terms

I'm trying to schedule a shutdown for 10:30pm (22:30) each evening. I am fairly new to Ubuntu. In Windows 7, this was an extremely easy task. Apparently in Ubuntu this is a rather complicated task. ...
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102 views

Automatic shutdown at specified times?

I'm aware I can use (sudo?) shutdown -h hh:mm in a terminal window to shut down a system, however the user that is logged in is a kiosk user, which is locked down in such a way that terminal (or any ...
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31 views

User specific cronjob

I need a user specific cronjob on my ubunt 14.04 server. But if I enter crontab -e as the user, vi opens and I can see /tmp/crontab.Lb3Khc/crontab" [Permission Denied] I have already created a ...
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1answer
90 views

cron runs at wrong time

I have a /etc/crontab file. It's pretty much the default one except for the daily tasks: '# m h dom mon dow user command 17 * * * * root cd / && run-parts --report /etc/cron.hourly ...
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36 views

incron tab won't fire

I'm trying to get incrontab running, but it won't work. This is the error I get: access denied on ~/propt/apo/feeds - events will be discarded silently and this is the line in incrontab I want to ...
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1answer
79 views

How to end a cron started script?

I start a script via cron which works fine. But when i then try to end that script via cron (either killall / pkill / pgrep does work) nothing happens. If i let cron try to kill it or try it my own ...
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1answer
128 views

How to stop cron from sending email when there is nothing in STDOUT or STDERR?

Ubuntu 14.04lts with Perl 5.18.2. This is a special case where Google did not help me. I do not want to turn off email for all cron jobs, I have about 15 jobs in my crontab. I need to see the ...
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49 views

How to configure cron

I´m very confused trying configuring cron. I have a file named "crontab" in "/etc/crontab" which I edited to show (I want a daily task at 2:00 AM) As it claims is the "system wide crontab" # ...
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36 views

CRON @reboot vncserver?

Is there any reason per-user cronjobs running vncserver @reboot wouldn't run? When I reboot the machine and look into /var/log/syslog, I see the jobs being run, then cron saying (CRON) info (No MTA ...
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2answers
34 views

Cron : How to delete directory via cron

I have allready installed cron and here it is 1 0 * * * rm -R /path/to/my/folder/$(date +'%Y-%m-%d' -d "yesterday") I want to delete every day folder with "Yesterday name" LIKE "2014-12-14" ...
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47 views

Crontab wont run this script!

I am trying to run this script as a cron job to enable a weekly back up of my mediawiki site. Running on Ubuntu server 14.04. It simply will not run. The scipt is running from the root folder of the ...
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43 views

reprepro - Is there any chance to enter the passphrase via bash-script?

I use "reprepro" for getting the latest Debian packages out of my local repository, which works fine manually. Now I need to automate this process through a cron job but the reprepro passphrase is a ...
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50 views

munin send mail about permission denied to munin-update.log

I have install munin, but CRON send me mail about an error: Can't open /var/log/munin/munin-update.log (Permission denied) at /usr/share/perl5/Log/Log4perl/Appender/File.pm line 103. but the ...
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1answer
64 views

Crontab weird extensin error Unable to load dynamic library '/usr/lib/php5/20121212/peacjson.so'

I am wanting to find out how I might get to the bottom of a repetitive error that is being e-mailed to me every 9 and 39 minutes past the hour: PHP Warning: PHP Startup: Unable to load dynamic ...
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1answer
29 views

crontab not running simple job

i have a very simple command in cron that should reboot my system everyday. I modified crontab in root with the following: sudo crontab -e I then added one line to the end of the crontab: 0 1 * * ...
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54 views

Backup database with mysqldump

Hello i use mysqldump with crontab for save my database each hour but after one day i have 24 files What is solution for auto delete if more 5 files ? And what is chmod for folder backup for security ...
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1answer
101 views

Shellscript creating directories in wrong direcroy when running from crontab

I have written the following code which will create directories with name format "nowt_hour_minute_second". In that directory another text file will be created with the directory creation time. Now I ...
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1answer
92 views

Launch url to start a script like a cronjob?

I have a website on mutualised hosting (server A). I need to run every minutes a script, I just need to go to http//www.mysiteserverA.com/run.php I searsch a solution automaticly run this script every ...
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17 views

rsync never terminates and makes Tb size snapshot directories

I have a cron job that runs rsync every day to download data from a server. It was working fine until the space allocated for me in the server was changed (probably increased). It happened as I was a ...
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1answer
236 views

What schedules logrotate?

I'm working on the program which creates a big log file. I want to handle it with logrotate. This is a configuration I put to /etc/logrotate.d/: /var/log/myproject.log { hourly maxsize 1 rotate ...
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3answers
547 views

Root crontab not running

For some reason, my root cron tab does not seem to be running. Trying to reboot device every night at midnight. Should be the following as root: crontab -e Then add: 0 0 * * * /sbin/shutdown -r ...
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39 views

Run cron job to execute a script when a particular file is updated

I would like to automate a process which requires running a script to generate some files. To do this I thought that adding a cron job to run this script would be great. But I want cron to run the ...
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1answer
26 views

Custom cron job filename for a package

I'm willing to create a cron job for a package but when I define it in debian/cron.d it gets installed as /etc/cron.d/package. I'd prefer to be able to change the name of the cron job to be something ...
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32 views

Many CRONs processes

My system from couple days have some strange issues. Main thing is that I can't ssh for most of my day. I noticed that is connected with amount of CRON porcesses. In crontab I have about 90 records ...
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1answer
91 views

This anacron cron job is sending emails to me - how can I redirect the output to null? [duplicate]

$ cat update-notifier-common #!/bin/sh set -e [ -x /usr/lib/update-notifier/package-data-downloader ] || exit 0 # Try to rerun any package data downloads that failed at package install time. ...
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1answer
45 views

How to implement in upstart that a service is preventive restarted every x hours?

I have a component --- started with upstart --- with a bug. The bug causes the application to freeze and unfortunately, it does not crush. As a temporary walk-around, I want to force the service to ...
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0answers
59 views

pmcmd not working with Ubuntu crontab or gnome-schedule

I have scheduled a shellscript which interns calls an informatica workflow with PMCMD command. when the script executed manually, it is starting the workflow properly but when the workflow is ...
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1answer
47 views

run a script and return system to suspended or running mode

Somehow I cannot find how to do this common task. I want to run a (backup) script daily at certain time regardless whether the system is running or suspended and return to the previous state ...
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1answer
33 views

Why am I getting this annoying log messages.CRON[17405]: (root) CMD every minute

I have configured rsyslog.conf file to store log messages to mysql but I am getting some annoying log message in my MySql table. which looks like this. Nov 3 14:48:01 username CRON[17405]: (root) ...
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2answers
75 views

Crontab unable to open google chrome

I have written a chrome extension that performs a task whenever it is available, and for that I would need the chrome browser open at all times. My idea was to have a check say every minute if the ...
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98 views

Scheduled Cron Back up from EC2 to S3

I have created a script for scheduling sql back ups and store in Amazon S3. Below is the script that I used for taking backups. DATABASES="testdb" testdb_USER=root testdb_PW=root ...
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1answer
39 views

CronJob not working as expected

I generated a cronjob line for crontab -e with Crontab Generator: * */2 * * * curl http://www.example.com/cron.php >/dev/null 2>&1 I was expecting that it should run every 2 hours. But in ...
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1answer
46 views

Cron process sends email, where are these sent emails?

Ubuntu 14.04 I have an email process that sends an email via cron, using sendemail (which I believe is a Perl program that doesn't need an MTA). Where are these sent-emails stored? If they are stored ...
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76 views

crontab and running nmcli in a script

I am trying to come up with some way of making a persistent VPN connection, so if it drops (as it does from time to time) the connection will be remade. I though using crontab would be the best way to ...
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votes
1answer
79 views

Launch a .desktop file from boot

I have a .desktop file on my desktop that launches a html page. I need the .desktop file to run from startup, what would be the best way to do this? I have tried crontab and also the startup ...
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1answer
59 views

Cron emails no longer going to local 'chuck' account

Ubuntu 14.04 installed as a VM on a machine that sends emails, with attachments, via Perl 5.18.2. That part works because Perl talks directly to the SMTP server. Let's call the machine name ...
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27 views

Reading Cronjob Output [duplicate]

I have a task setup to run on my cronjob where I need to read the output. What I need from the output is the starting character (let's say A) and the ending character (let's say Z). A helps me ...
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2answers
194 views

Performance loss after 30 minutes

This one's baffled me. I have Ubuntu 14.04, 3 days ago (2014-20-10) it started slowing down. I've reproduced it by opening gedit and then closing gedit, when the issue is active it hits roughly 2 ...
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2answers
1k views

Cannot run bash script from crontab when it works from command line bash

I have a strange problem of being to able to run a bash script from commandline but not from the crontab entry for root. I am running Ubuntu 12.04. * * * * 1-5 root ...
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1answer
116 views

shutdown 5:30pm every day

for a five thirty pm shutdown, should I change this: 30 02 * * * /sbin/shutdown -h now to: 30 17 * * * /sbin/shutdown -h now see also: Crontab Shut down command didn't work
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38 views

Auto Update Even When Laptop Lid Is Closed

I am trying to follow this guide for auto updating Ubuntu. I am using the Advanced Aptitude option. My problem is that I am trying to do it on a laptop and cron doesn't work when the lid is shut. I ...
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2answers
86 views

How to create a cron job to monitor the status of a port ?

I am trying to create a cron job that would allow me to monitor the status of a particular port and send out notification via email while it changes from listening state to anything else.
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vote
2answers
1k views

How to make crontab email me with output?

How can I make crontab email me with the output of its jobs? I have MAILTO=redacted@yahoo.com.au above the jobs, but it doesn't work. I know I need to use something like Postfix or Sendmail but for ...
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3answers
211 views

Run rkhunter regularely on a desktop system

I want to get a warning on my desktop when rkhunter finds something odd on my system. I whitelisted some files and dirs that seem ok in /etc/rkhunter.conf so I get no warnings anymore. Now I want to ...
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1answer
140 views

git push script, only if difference

I've found some nice questions illustrating how one would write a script automating git push/pull with cron here and here, but I want to elaborate on that slightly. I only want to push/pull if there ...
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0answers
27 views

truecrypt in bash script called with crontab

I have a bash script that uses truecrypt to mount a volumn. The command is the following: RESULT=$(truecrypt $FILE 2>&1); When I execute the script with bash script.sh I receive the ...
2
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2answers
210 views

Cron Job Creation

Okay, so I have had a quick look at the answers posted on this question and re-formulated my cron job. So, let me break this down as clear as I am able to: PC/OS | Shell Info I am currently running ...
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vote
1answer
108 views

Question about CRON trim weekly

I have got samsung SSD and so TRIM is on automatically. However I am bit confusing about how TRIM cron weekly starts. According to cat /etc/crontab it says that CRON weekly will start at 6:47am (odd ...
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1answer
80 views

How do I change my cron loglevel to 7 from default value 1?

> man cron, tells me that the default log level for cron is 1; i.e. cron "will log the start of all cron jobs." I want to set that to 7, so I checked in all the wrong places, starting with the file ...
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1answer
135 views

Cron job daily not running

I'm having trouble with setting a cron job to run daily when I enter the script to /etc/cron.daily when I put it there it doesn't run at all like it should be doing. I setup a script so that it can ...