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

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running a script every 30 minutes with crontab using ROOT (Debian)

When I manually type: root@username:~# ./myscript.sh the script executes, however I tried the following combinations to have crontab execute myscript.sh every 30 minutes (forever) and none seem to ...
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252 views

Script from cron doesn't create archive

I'm using: # cat /etc/redhat-release CentOS release 6.4 (Final) Have an script in user's crontab: $ crontab -l 0 7 * * * /home/teamcity/scripts/TC_backup.sh If I run this script under this very ...
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Bash script to delete a file called index.html recursively

I need a bash script (not sure how to write the actual .sh file) which I could set to be run by cron every minute and that would delete files with the name index.html that are in a specific directory ...
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2k views

What causes cron to continuously send mail and how can I disable it?

I have a problem on CentOS 6.3 system where the crond process tries to unsuccessfully send mail over and over (at least I think this is what its doing) until the OS eventually generates a "too many ...
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“stdin: is not a tty” mails for running scripts as cron jobs

I have several shell scripts (bash) which are started by cron. Every time a script is executed I get an email saying "stdin: is not a tty". Can someone please tell me how to fix this? All scripts run ...
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Unplug AC causes anacron to stop. No resumumption if cron.daily had already started?

Anacron is started/stopped by a number of means, one of which is when AC power is plugged/unplugged, as can be seen by examining /etc/apm/event.d/anacron and /usr/lib/pm-utils/power.d/anacron. You can ...
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241 views

Rotating iptables logs, strange message about script being converted to upstart job

I use a script /etc/logrotate.d/iptables containing entries like: /var/log/in_iptables.log { rotate 4 weekly missingok notifempty compress ...
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48 views

How do I interpret an entry about cron in Gnome System Log Viewer

Apologies if this turns out to be a trivial question. I am trying to set up a regular backup of my files prior to installing Fedora 19 instead of my current Fedora 12. In November 2013 I started a ...
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585 views

Crontab change MAILTO for only one specific job in Root's crontab

Can I do the following to change where mail goes for one specific crontab job in root's crontab (don't sent to root for Do Something job, just send to porklover): # Make a hambone appear * * * * * ...
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96 views

Does cron impose some limitations to types of commands and privilege of execution? [duplicate]

I've experienced an issue where some of my scripts run perfectly fine when I call them manually, but these same scripts when called as cron jobs via cron don't seem to work at all. So my question: ...
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How to restart the Python script automatically if it is killed or dies

I am running my Python script in the background in my Ubuntu machine (12.04) like this - nohup python testing.py > test.out & Now, it might be possible that at some stage my above Python ...
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156 views

Running cron jobs under php ver. 5.4

My hosting company switched me to php version 5.4. I run a Drupal site (D7.) They say: You'll want to make sure your crons use "/usr/php/54/usr/bin/php" instead, as otherwise it will use PHP 5.2. ...
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265 views

Disable cronjob after reboots

How can I prevent cronjobs from automatically starting after my server has rebooted? Every time I reboot my server the cronjobs start up again, which I'd like to prevent. These servers are running ...
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276 views

Is this sar/sysstat cron job formatted correctly?

I want it to give me all the sar/sadc options, interrupts,disk,etc.. every 10 seconds starting at noon for the entire hour. On the second line I want to capture the info in /proc/interrupts every ...
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109 views

Cron does not execute xinit command

I have a command that works perfectly when launched from the prompt: xinit /home/user/myscript.sh -- /usr/bin/Xvfb :1 -screen 0 1x1x8 But is not executed when put in crontab: @reboot xinit ...
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583 views

How to restore default crontab file

I have recently lost my cronjobs. now when i do crontab -e i am presented with an empty file. i would like to get the default file back with the nifty comments and explanaitions at the top!
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Day of week {0-7} in crontab has 8 options, but we have only 7 days in a week

Day-of-week: Allowed range 0 – 7. Sunday is either 0 or 7. I found this after Googling, my question is why should both values (0,7) correspond to Sunday?
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333 views

Suddenly lost all cronjobs

All of a sudden my cron jobs don't work any more. When I type crontab -e I am presented an empty file in the editor /tmp/crontab.3fMYGi/crontab And by empty I mean that not even this standard ...
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855 views

Is setting a higher nice level for a process an effective way to reduce its impact on system load/CPU time?

I have an rsync cron job which is pushing the server load and triggering monitor alerts. If I set the job to be run with a high nice level, would that effectively reduce the impact it has on system ...
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292 views

How to add the logs to a crontab with time stamp [duplicate]

In crontab, I scheduled a daily backup script. Now when the cron executes the script the status are logged to a log file as shown below. 0 0 * * * /home/backup.sh > ...
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167 views

How to switch tty with a script / cronjob

Is it possible to switch the current tty/vt with the help of a bash script or a cronjob? I only know the physical keyboard input "Ctrl-Alt-Fx". I would like to show two virtual desktops at different ...
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238 views

Bash if script is called from terminal echo stdout to terminal, if from cron do not echo output

I would like to have a service watchdog script echo the status to the screen if called like ./watchdog.sh but if it is run by cron, there is no need to echo output. What is the proper method? Where ...
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344 views

Mysterious automated emails

I remember messing around with crontab and setting up email capabilities on a server many months back, and now all of a sudden I'm getting the following email: EMAIL HEADER: from: root ...
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Where to put system cronjobs?

If I need a cronjob that runs at system level (i.e. not specific for a certain user) how do you suggest me to create it? running crontab -e as root appending it to /etc/crontab creating a file ...
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794 views

Create cron as a apache user and run as root user

I am creating this cron as apache user and want to run this cron as root, below is my code snippet: # Create a cron job to restart apache cron_file="/etc/cron.d/restart_apache_crontab" cron_job="*/1 ...
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98 views

Why don't these cron jobs run?

Here is my crontab: # rsnapshot jobs 0 9-21 * * * /usr/bin/rsnapshot -c /home/kaiyin/.rsnapshot.conf hourly 52 22 * * * /usr/bin/rsnapshot -c /home/kaiyin/.rsnapshot.conf daily 42 22 ...
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Shell script passing null value while executed as cron job [closed]

We are using the below commands to get pagesapce values and I need to check percent of used pagespace. For this I have used the below code, but when running this script it's passing a null value into ...
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221 views

How to rebuild /etc/cron.d on CentOS?

I installed an RPM on a CentOS machine that was supposed to merge its own files contained in a /etc/cron.d structure with the current /etc/cron.d. However it replaced the current contents. I believe ...
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1k views

create a cronjob to run php script

I've created a cronjob in Xubuntu to run a PHP script in every 5 minutes. I did it as follows. I entered the following command: $ crontab -e Then entered the following: */5 * * * * /usr/bin/php ...
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How do I completely silence a cronjob to /dev/null/?

On my Ubuntu-Desktop and on my debian-server I have a script which needs to be executed each minute (a script that calls the minute-tic of my space online browsergame). The problem is that on ...
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How to use Crontab for a java file in linux

How can I use Crontab in Linux specifically for a Java program? I want to run a MIS Script. How can I crontab it and what should the path be?
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Mailing output of cron

I have this script which I run once a month, and I want to get the output sent to my email. If I run it manually like so, then the standard output is sent to my email. ./monthly_mail.sh | mail -s ...
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215 views

Does cron jobs per se represent a significant burden on a modern system?

I'd like to run a pretty simple script (is there a dir with name x in dir y if so move it to dir z–and x will only be there about once a day) every 15 seconds or so (one minute divided into 4*15 ...
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75 views

Command to run an application within a specific directory

I want to be able to type a line of command to do the following two commands that I know: cd ~/rpitwit_commands/ rpitwit This is because I want to automatically run it upon boot in crontab, and it ...
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588 views

How to check whether my cron job for backup using tar was succesfull [closed]

I have a cron job to tar backup websites and databases and upload the backup to a NAS. Instead of checking the tar files on the NAS. Is there any way to check if the tar backup process completed ...
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367 views

How to respawn vpnc when it stops?

As root, I've setup a crontab rule that launches vpnc everyday early in the morning (before I arrive at my workplace). But it often occurs that the vpn stopped mid day. As a result, I have to sudo ...
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wget command not working in cronjob

here is my command : wget -c -O /home/alireza/Desktop/1.mkv http://mysite.com/myfile and here is my /etc/crontab file : SHELL=/bin/bash PATH=/sbin:/bin:/usr/sbin:/usr/bin MAILTO=root HOME=/ 0 2 ...
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101 views

How to run a script as soon as the week number changes?

I would like to keep my download folder sorted. My goal is to have the files of the current week in the download folder, and the older files in a folder named after week number and year (eg 2013.09, ...
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832 views

Daily logRotate for apache at specific time

How can I execute logRotate daily at a specific time (3h30) each day? Specific details on how to do this would be appreciated. I'm on Debian.
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Crontab + Ruby on Rails: /usr/bin/env: ruby: No such file or directory

I have a ruby on rails app and I need to schedule a crontab for a rake task. */5 * * * * RAILS_ENV=production /usr/local/bin/rake -f /usr/local/www/mysite-web-production/current/Rakefile ...
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Is there a update manager whitout gnome dependencies for xfce?

I'm looking a update manager for Debian Xfce. I installed xfce on a computer which will be use by laypersons. Therefore, I want another way (graphical) to launch apt-get update && apt-get ...
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1answer
275 views

output of top gets truncated to 80 columns when run by cron

I have got the following logging script: #!/bin/bash top -b -c -n 1 >> /var/log/toplog/top.log And the following record in my crontab: */1 * * * * /home/clime/scripts/toplog.sh The ...
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How to only output commands from CRON?

INPUT: * * * * * ( /path/to/foo -x ) 3 * * * * /full/path/tothing 3 3,2,4 * * * /full/path/tothing4 3 OUTPUT: ( /path/to/foo -x ) /full/path/tothing /full/path/tothing4 3 Q: How can I truncate ...
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Globally change path for all users, even in cron

We're setting up an SGE cluster with CentOS 6. My sysadmin is installing applications that are not installed via RPM (i.e. via other means like make install) should go in a non-standard directory, in ...
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How to change cron shell (sh to bash)?

Is it possible to make commands in crontab run with bash instead of sh? I know you can pass commands to bash with -c, but that's annoying and I never use sh anyway.
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Rsync problem with cron and no problem manually

I have a backup.sh file that launch an rsync command. This rsync is to backup my dedicated server on a RaspberryPi running raspbian. (I use keychain so I don't need to type any password etc ...) The ...
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2answers
251 views

How can I manage my crontab effectively to avoid issue by multiple updates by multiple users?

I have a crontab that includes many users updating it. The problem is that because of this, it is not easy to know who did what modification of a cronjob. I was thinking to create a script to do a ...
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2answers
522 views

Why are new cronjobs ignored unless crond is restarted in SLES?

I added a new cronjob with a user (SUSE LINUX Enterprise Server 9.4): # su - XXX $ crontab -e and this is what I added: * * * * * echo `date` >> /home/XXX/a.txt but the a.txt isn't ...
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180 views

Cron Job Clean Directory

How is it possible to delete files older than 14 days in a folder using a cron job? Everything I have tried so far hasn't worked.
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cron: bash syntax not working

I am trying to add following command to crontab: I=1; for X in $(/bin/ls -r /var/tmp/*); do [ $((I++)) -le 28 ] && echo "lower" || echo "higher"; done When executed on the command line (in ...