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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Who runs scripts inside /etc/cron.hourly if anacron is enabled?

I've read that if anacron is enabled cron doesn't run the scripts inside cron.weekly/hourly/daily/hourly, as not to run them twice. So anacron takes responsability on that folders. However anacron ...
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Crontab command does not function properly

I have the following crontab entry to automate copying of my files to separate W/S in the network. However, it does not copy the files but produce the log file. here is the file contents #! /bin/...
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59 views

cronjob to remove directories that are smaller than x in size

I want to run a cronjob every 6 hrs that deletes directories smaller than 200MB. I know dh command would do the job, but i'm not sure how to use the command. Any help is appreciated.
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698 views

How To Run A Shell Script Again And Again Having X Interval Of Time In Root? [duplicate]

I have a shell script in my Ubuntu Server 14.04 LTS at ./ShellScript.sh. I setup /etc/rc.local to run the shell script after boot but before login using below code. To run run it boot write this ...
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How do I configure exim4 to send mail through a password protected ssl smtp mail server?

I'd like my cronjobs to be able to send mail from my home computer. My servers configure exim4 like this: dc_eximconfig_configtype='internet' dc_other_hostnames='' dc_local_interfaces='127.0.0.1' ...
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535 views

Unable to execute expect script via cron even with the permissions set to 777

I created an expect script that won't seem to run when called by cron. I included the full path in cron when calling it as follows. * * * * * /usr/local/sbin/checkForRemoteTasks >/...
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278 views

Tell me where is mistake in anacron task?

I have tried to make this task for abacron: dm@dm-system:~$ cat /etc/anacrontab # /etc/anacrontab: configuration file for anacron # See anacron(8) and anacrontab(5) for details. SHELL=/bin/sh PATH=/...
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62 views

Scheduled tasks won't run simple command

The command below works fine in terminal but won't run using the gnome scheduled tasks. pacmd set-sink-volume 0 42768
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427 views

Is it possible to a crontab file containing 1k+ lines of schedules?

I'm planning to create scheduled tasks and I want linux to handle those tasks using crontab. Note: some tasks have different schedules and some are the same [crontab file (schedule.cron)] * * * * * ...
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94 views

unwanted periodical restarts

A couple of weeks ago, I thought I solved the cron job problem which is responsible for unwanted periodical restarts in 60 mins. I used acpi=off line for this. But now the problem occurs again with ...
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node.js app runs from command line but gives errors when run from cron job on reboot on ubuntu 14.04 LTS

When starting my app manually using forever, it works fine. It runs on localhost:8080 and nginx does the routing. When using a cronjob my starter.sh script runs but in the forever log I get an error. ...
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239 views

Upgrade to Kubuntu 14.04 Hangs at Stopping Cron

I just attempted to upgrade from Kubuntu 13.10 to 14.04 using the Muon Update utility, but after downloading all required files, the update process stalled with the message "Cron: Stopping..." After ...
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2answers
750 views

Set server timezone but not working with crontab and phpmyadmin

TimeZone is not working properly I am using linode server running ubuntu 12.04LTS. My Question is when i configured timezone by using dpkg reconfigure tz as IST ASIA/Calcutta. It shows correct ...
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7k 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 ...
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337 views

Vixiecron doesn't allow disabling of emails, how can I disable cron emails globally?

Every time the cron runs there are some sendmail processes being created which take our machine to huge high loads. We have chased this problem down to cron and sendmail. Adding MAILTO="" on top of ...
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1k views

printf, redirection, crontab

I'm having trouble redirecting C printf statements to a file with a program running as root. I have a program with several informational printf statements and other libraries which print errors via ...
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1answer
523 views

Cron job not working properly on start up

Thanks for reading this. I have created a bash script to backup my databases. The script will create a directory for the day then create a backup file for each database within that directory. It ...
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797 views

bash script to back up file [closed]

I have a few files to be backed up. I need a script to check line number of a file and if it exceeds, say 8000 lines, it will simply zip it and name it with date prefix format. I need your help.
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“Backup Intervals” in rsnapshot.conf?

A simple question about rsnapshot. In order to perform daily backups I'm going to add lines to cron in my Ubuntu. Then, why do I have also these lines in the rsnapshot.conf ? #######################...
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355 views

How can I configure a second SSH key + user for a single server?

I have a SSH key which is passphrase-protected. Authentication to the server is by SSH key only, password authentication is disabled. Both the server and my desktop run Ubuntu 14.04 and authentication ...
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1answer
1k views

How to launch interactive shell script in bash hourly with cron?

I put this line in the crontab: 1 * * * * DISPLAY=:0.0 /usr/bin/gnome-terminal -e /home/user/Desktop/mltpl The script is executable. If paste that command in the terminal--that is, the string ...
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116 views

Crontab does not work

I have 2 crontab commands. The cron below works fine: 00 19 * * * cp -a /home/kmportal/VirtualBox\ VMs/cyn.in-disk1.vmdk /media/windowsshare The cron below does not work after I add the time ...
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241 views

Using unattended-upgrades or cron for automatically updating packages from different sources?

I'm running Ubuntu 14.04 + XBMC on a HTPC and now I want to setup automatic updates on this machine. On top of the normal Ubuntu sources, I have also 3 other sources installed, of which I want to ...
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4k views

Cron job not running - postfix/sendmail error

Here is my content of sudo crontab -e @hourly /home/userName/ntpdate.sh The content of my script (ntpdate.sh) //.25 is my ntp server echo "Current time is $(date), " >> /home/...
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161 views

How to tell cron to find paths to tools?

Is there a way to indicate to cron how/where to find (paths to) tools such as python, nmap, php and so on? I ask this because when I schedule a job using crontab -e, I always need to specify the ...
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96 views

cron does not work

I read about cron. I edited it by running crontab -e and I added this line: * * * * * php /var/www/createFile.phpWhen I run ls /tmp/ I do not see any file create by my php script. Why does not it work ...
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109 views

How to schedule an irregular backup script requiring user confirmation

I have a backup script which requires user interaction. I would like to schedule it to run, say, once a week. The constraints are that (1) the computer boots straight into Gnome and is turned off ...
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269 views

Which tasks in “Scheduled Tasks” (gnome-schedule) use anacron versus cron?

I am trying to run a command once a day, but my machine is not always on. anacron says it's meant for such purposes, but I prefer to use the Gnome Scheduled Tasks GUI program. If I schedule a task to ...
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548 views

Start a transmission-gtk using a cron job

I'm trying to start my torrent client using a cron job. Following is the job I added to crontab file(contab -e) 00 20 17 07 * transmission-gtk I waited for the time but transmission-gtk didn't ...
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104 views

Crontab Instances

I have been doing some research on scheduling tasks and what not. I came across the crontab command function. Is crontab a file that is created or is it a command? If it is a file, then how many can ...
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729 views

Cron Job Not running after proper setup

So I created a cron job as shown below: GNU nano 2.2.6 File: /tmp/crontab.uNoEXy/crontab # Edit this file to introduce tasks to be run by cron. # # Each task to run has to be ...
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Who is sm-msp-queue and how does he/she/it flood my /var/log/syslog?

I run Linux BeagleBoard-xM 3.12.5-armv7-x10 #1 SMP Fri Dec 13 03:06:20 UTC 2013 armv7l armv7l armv7l GNU/Linux and my /var/log/syslog gets flooded by messages like Jan 11 10:21:09 BeagleBoard-xM sm-...
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What does this (root) CMD line in system.log mean? Why is it there?

What does it mean? (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/...
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777 views

sending email from cron with correct format

I am stuck when sending email in correct format from cron jobs executing my php script which fetches records from mysql database. i have a php script which fetches records from database and renders ...
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1answer
4k views

Run the script file after 5 or 10 min after restarting the system

I have created a ruby script file that checks the connection present or not. For example checking port 22 is opened or not. Firstly I tried with cron job as follows @reboot find ${HOME}/my_app/...
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82 views

Error starting python file using cron

I'm trying to get a python file to run every 2 mins, I'm using the following cron command but the script never runs. Would anyone know what the possible errors could be related to starting a python ...
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3k 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 ...
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96 views

Crontab not run job and change job

I've set 'Crontab' with root user and -e key but Cron is not running my jobs and after little time, my job is removed and replaced with other text!!!! The jobs set: # m h dom mon dow command @...
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1answer
2k views

Why is my cron script to dump a MySQL database not executed?

I have the following cron job: * * * * * /home/db_backups/test.sh which runs fine and is executed every minute. If I check with sudo grep \(CRON\) /var/log/syslog I get the following: Jun 23 11:30:...
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crontab with espeak doesn't work when sound card is busy with google hangouts

There may not be a solution to this, but here's the problem nonetheless :) I'm on Ubuntu 14.04, using latest Chrome as my browser My sound card is busy being used by Google Hangouts My crontab is ...
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3answers
1k views

Cleaning up yesterday's files via script

I would like to run a cronjob that ran every morning to move the files that were created on the previous day in a specific directory to be moved to a folder that has been created with the previous ...
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1answer
287 views

update from 12.04 to 14.04, cron stops working

I am having trouble of using cron after updating from 12.04 to 14.04. here is my log: May 8 11:00:01 imanqasrina CRON[30716]: (sicksand) CMD (bash $HOME/bingwallpaper/bingPaper_v1-0.sh) May 8 11:...
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148 views

Understanding the at-command to schedule another command

I use cron to schedule things in Linux, but recently I discovered the "at" command. sudo apt-get install at I don't understand the scope from which this command operates: How would you schedule a ...
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sendmail with cron job

a=$(df -h /mnt/smb | tail -n +3 | tr -s ' ' | tr '%' ' ' | cut -d ' ' -f 5) echo $a if [[ $a -ge 30 ]]; then cat /etc/diskspace/text.txt | sendmail test.gmail.com fi Hallo guys this is my ...
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217 views

Does duplicity detect when a Backup Is Already In-Progress?

Any time you schedule a recurring backup, it is always possible for a previously-initiated-backup to run so long that the next scheduled backup gets initiated before the previous backup completes. ...
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Start Skype on boot with crontab [duplicate]

I includes these entries yet Skype don't manage to start on boot: @reboot /usr/bin/./skype @reboot /usr/bin/skype
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300 views

difference between atjobs & atspool directory

when i was working with ubuntu 12.04 at command i noticed that there are two different directories /var/spool/cron/atspool and /var/spool/cron/atjobs . I want to know what is the difference between ...
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671 views

Cron job running successfully suddenly reports script is not found

What might cause cron to suddenly report a file it is supposed to run is "not found," when the file hasn't been touched, and in fact, the entire system hasn't been touched since it last ran ...
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2answers
377 views

Cron doesn't execute one of the scheduled jobs

I'm using a lubuntu desktop, distribution Ubuntu 13.10, i686. This is my problem: in the job list scheduled by cron a job hasn't effect, but in /var/log/syslog its execution is traced. This is the ...
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1answer
871 views

Bash script runs fine, but not in cron

I have a script that's supposed to record a shoutcast stream for an hour, convert it to mp3, and then save it. The script runs correctly when I run it from the terminal, but I can't seem to get it to ...