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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92 views

Minutely cron job is not running

I added the line */1 * * * * /home/zach/test.sh to my crontab, where the contents of /home/zach/test.sh are as follows: touch /home/zach/test.txt Yet, no file test.txt is being created in that ...
2
votes
1answer
672 views

Schedule to turn off monitor via crontab?

I want to turn off monitor on a specific period of time automatically (for example between 07:00 and 11:00). Is there any command to be set in crontab file? Is there any better way? In summary: ...
7
votes
2answers
22k views

How can I see/stop current running crontab tasks?

How can I see crontab tasks which are in progress? How can I stop crontab tasks which are in progress, manually? Is [this] question about see the current running cron processes? Yes To ...
2
votes
2answers
5k views

Getting output from a cron job on the terminal

I have a program that prints some output that I would like to pop up on my terminal once every hour during the workday. $ crontab -l 0 07-17 * * * /home/dat/scripts/cron.out syslog reports the ...
3
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2answers
2k views

Automating duplicity backups using cron

How do I automate duplicity backups using cron using gpg encryption and the ssh backend?
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1answer
138 views

Cron fails at night

I have set up a cron job, but for some reason it fails to run during the night. The same job runs fine when i'm running it during the day (i.e. setting up the same job to run in a few minutes and ...
1
vote
1answer
158 views

Need a way to start web cam recording at specific time

I have a laptop with an integrated camera and I want to write a script that will record a 10 minute video when the clock reaches a certain time. What apps/commands can I use to achieve this?
2
votes
1answer
192 views

Crontab not working with inner unix command

I have following crontab entry which does not work. Please can anybody help? @midnight scp /home/xxx/file.txt xxx@yyy:~/zzz/file.txt_`date +"%m-%d-%y"` This command works very well when run from ...
4
votes
2answers
900 views

A script to monitor new files in folder so I can add them to an external XML files

I want to monitor (by cron, I got that part covered :P) new audio files in folders so I can add them toa separate XML files which act as an podcast RSS feed. The file structure looks like this: - ...
4
votes
1answer
2k views

Hourly GIT Push

Is it possible for me to automate a Git push every hour via a batch script. I would typically type in this: git add * git commit -m "latest update" git push ...
1
vote
1answer
802 views

Machine stops suddenly, Only hard reset can help

It is happens sometimes, im just working and suddenly machine starts lagging. Then it can totaly stops (Nothing works, mouse, keyboard etc.), or sometimes not. Jun 5 16:04:12 c0rp kernel: [ ...
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0answers
72 views

Backup regimen - is this plan any good?

I have a desktop that has some valuable personal and financial records, photos, etc. I installed a second drive formatted ext3 called 'internalbackup'. I've been using a variety of backup programs, ...
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1answer
528 views

Why anacron does not call the crontab user files?

I want a special command to be lauched everyday, but dont want to put it in the /etc/cron.d/ because its a user specific user! pg@pipoTower: ~$ crontab -l # m h dom mon dow command 0 0 * * * ...
2
votes
2answers
5k views

How do I setup two cron jobs to run every night at 3:00 and 3:10?

I have an ubuntu home server running virtual box. I have virtual server running on that box that I am having problems with. For now I don't have time to troubleshoot the actual issue but I have ...
2
votes
2answers
6k views

executing a shell every minute using cron

i want to run this bash code every minute using cron. I saved it onto /root/activate.sh #!/bin/bash for file in /home/user/torrents/*.torrent do if [ "$file" != "/home/user/torrents/*.torrent" ]; ...
0
votes
1answer
241 views

Can't seem to get script/cron job to work?

ive written a ffmpeg script to mass convert mkv into mp4. when i run the script as my user, and enter my password for sudo privileges it works very well from the command line. the script is: #! ...
4
votes
5answers
3k views

Notify-send doesn't work from crontab

I made a script that should notify me when there's a new chapter of manga that I'm reading. I used the command notify-send to do this. The program works when I am trying to run it in terminal. The ...
1
vote
1answer
380 views

remove completed downoads from rutorrent

I just setup rutorrent after being a long time rtorrent user. I want to remove the completed downloads. When I use a .torrent file i just have .rtorrnt.rc remove the file and rtorrent removes it from ...
2
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2answers
2k views

Crontab not running a script

I have set my crontab to run 2 script: $ crontab -l 0 20 * * * /usr/bin/bkp.sh --silent > /home/perforce/logs/bkp.log 2>&1 0 21 * * * /usr/bin/flsbk.sh --silent > ...
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2answers
9k views

All commands in my crontab fail with “Permission denied”

crontab -e and crontab -l work just fine: $ crontab -l | grep -v '^#' * * * * * /usr/bin/env * * * * * echo 'Hello from crontab' However, I see two messages like this every minute in ...
0
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2answers
228 views

cron job not executing youtube-dl command

I want to use the "youtube-dl" command in a cron job to download videos fron youtube. Therefore I created the following cron job: 26 00 * * * /usr/local/bin/youtube-dl -o ...
4
votes
1answer
688 views

Rsync behavior in a cron script

I have an nfs device that creates checkpoint (backups) everyday. I want to use Rsync to copy these checkpoints to another device (Drobo connected via iSCSI). So I've run the script on a single nfs ...
0
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3answers
370 views

How to open a crontab file in c++

I am working on a QT application which makes the usage of crontab easier with GUI. But I am facing the trouble of including the jobs in the crontab file from my application . So how do i open a ...
1
vote
1answer
368 views

Startup script doesn't execute at startup

I have followed the tutorial here that shows how to setup the No-ip update program to start at system startup. I have done exactly as specified here, yet the program still doesn't start. Also, when I ...
2
votes
1answer
2k views

Run two commands sequentially uisng crontab

My 3-year girl loves SuperTux. she couldn't control the mouse! so the game should run automatically on startup and after the game, computer should shut down automatically, too. however I put the ...
3
votes
1answer
455 views

Can't get MAILFROM to work in crontab on Ubuntu server 12.04

Is MAILFROM supported in crontab in Ubuntu server 12.04? Cron job errors are sent via exim ok, but the sender, root@localhost, is not acceptable. MAILFROM in crontab works fine on my Fedora Core 15 ...
2
votes
1answer
640 views

Shell script runs fine by itself, but not in cron

I have a shell script that runs nmap on an address, and I want to have it do it daily for me. So I added a reference to it in my crontab. Unfortunately, for some reason it doesn't recognize the ...
0
votes
5answers
9k views

Cron job to restart Apache

Ubuntu Server 12.04. I use: sudo crontab -e * * * * * root /etc/init.d/apache2 restart > /dev/null 2>&1 sudo restart cron And it doesnt work. How to fix it? So many docs in google,I need ...
1
vote
1answer
425 views

Kill a cron job from cron

I want to start the ubuntu update at night because internet is free at that time. and then kill the process in order to ensure that it does not download anything after 7:00 AM. Is there any way to ...
2
votes
1answer
121 views

How to run a cron entry periodically?

I have a line of script that works through terminal and works through cron to run one time: it downloads a file from the internet and saves it in a specific place named as the date it was found: cd ...
1
vote
1answer
222 views

crontab does not run

i have added a script to run every min like this crontab -e and then add this code * * * * * /bin/sh /home/user/Public/call.sh the code did not run then i restarted the cron sudo ...
2
votes
1answer
171 views

Script that opens webpage and records it as cron job

I need and have to create a script that takes webpage address and time in seconds as arguments. It records whatever is shown on the webpage - i.e. JavaScript and HTML content (Flash not required). ...
2
votes
1answer
397 views

How can I create popup windows?

I have a small script run by cronjobs to synchronize a git repository every 2 hours. The git will be pushed to the server with a constant message. How can I have a popup windows which ask the message ...
2
votes
1answer
3k views

Running two commands in crontab

I have this line in my crontab file */1 * * * * espeak 'foo' && espeak 'bar' But only half of it, first command gets executed every minute. While when I write this in the terminal it works ...
2
votes
3answers
4k views

How can I use Cron to run shells scripts at a fixed time?

I am wanting to learn cron and I searched for some quality tutorials. I found How do I set up a cron job. My goal is to have a folder on a network that will have sub-folders. Each sub-folder is a ...
4
votes
3answers
3k views

unattended-upgrades not running, /etc/cron.daily/apt missing

I have automatic-upgrades installed and configured, but it never seems to run, because there are always security updates waiting to be installed when I check. ...
0
votes
2answers
2k views

Cron not working

Wrote a short shell script "wallch.sh" to randomly change my desktop background: DIR="/home/user/Wallpapers" PIC=$(ls $DIR/*.jpg | shuf -n1) FIL="file://" gsettings set org.gnome.desktop.background ...
2
votes
2answers
494 views

create backup from directory

I would like to create backup from directory using cron. I wrote following command: cd path && sudo zip -r "backup-$(date +"%Y-%m-%d").zip" git/ && sudo mv "backup-$(date +"%Y-%m-%d").zip" /backup/ ...
0
votes
1answer
2k views

How to stop cron from mailing me?

I have setup a ssmtp server with my gmail username and password. After that i have been getting constant emails from my laptop to my gmail. Here the mails. The first one is somewhat like this: The ...
2
votes
2answers
48 views

Is it possible to list the actual commands that have been scheduled with `at`?

I'd like to be able to see exactly what has been scheduled with at. atq will list the job id, time to run, and user to run as, but not the actual task that will be run. Thanks! Edit I should add ...
7
votes
2answers
2k views

what can be causing /etc/cron.daily/apt to hang?

Lately I've been getting a mail from the server every day, Subject Cron <root@host> test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily ) Body ...
2
votes
0answers
132 views

Need to setup email notification when system starts and shutdown

I would like to have the system send me a email notification everrytime the system starts or shuts down. I am currently running Ubuntu 12.10 I found this tutorial but I couldn't make it to work.
1
vote
1answer
363 views

running deja-dup as cronjob, BU disc not connected

I have a problem with my backup cronjob. I use these settings (as proposed in that post): 15 * * * * env DISPLAY=:0 /usr/bin/deja-dup --backup During runtime deja-dup says: Backup location not ...
0
votes
2answers
496 views

How to set up directory backup?

I have Ubuntu 12.10 installed running a LAMP stack for a small site I host. I need to set up a system for weekly backups of the /var/www directory where all of my sites are. What is the best possible ...
1
vote
0answers
63 views

Why are alerts still coming if a job is commented out in cron?

In cron entry I have disabled the ignite recovery tape backup. But still we are getting alerts as: The action /opt/osit/omniback/bin/check_make_recovery.pl failed Crontab entry : # Ignite ...
3
votes
1answer
685 views

root cron job not running

I am trying to configure automysqlbackup to run via a cronjob to backup my dbs nightly. When I execute sudo automysqlbackup from a terminal, the process executes as expected and creates the backup ...
1
vote
1answer
108 views

How to prevent automatic apt-get operations from running for a while?

In a production context, we run scripts to configure/customize the OS. It makes intensive use of apt-get (to install, remove, update, upgrade packages). Unfortunately it happens (especially just ...
1
vote
1answer
6k views

Thousands of pam_unix log entries in logwatch

My logwatch reports, within the CRON section, contain thousands of entries like those below. How can I either reduce the number of log entries OR have logwatch ignore them? Jan 30 18:49:01 ota3 ...
3
votes
1answer
349 views

Cannot get gsettings set to work at boot using cron, rc.local, or autostart

I am trying to "lock down" the computer by running a script at boot that turns lock on, lock screen after 10 min and require password, etc. I am using Ubuntu 12.04 I have tried editing crontab, ...
2
votes
1answer
446 views

Cronjob for security updates?

I'm having trouble creating a cronjob for automatic security updates on my ubuntu server 12.04. I separated the security sources into a different file, and then did this from within a cronjob: ...