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

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“No space left on device” - plenty of space and inodes left [closed]

I am using amazon linux on an ec2 instance. I am running a cron script as root that copies files to a different directory on the same machine, but some of the file copies are failing with a "no space ...
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1answer
154 views

cron runs job at unexpected times

I have set up a cron job on my local Ubuntu 12.04 server to log on a remote server through a passwordless ssh connection and run mysqldump on a database on that server once a day. My problem is that, ...
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2answers
281 views

using mergecap for set of files

Im trying to use mergecap to merge 15 old pcap files in a folder. I tried to use FILES=($(find /mnt/md0/capture/DCN/ -maxdepth 1 -type f -name "*.pcap" -print0 | xargs -0 ls -lt | tail -15 | awk ...
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126 views

filter cron emails through procmail?

I'm using postfix/mutt/procmail on a Linux/Debian and I've some trouble filtering cron emails with procmail, I just want to move them to the cron/ maildir directory, but no lucky till now. I've ...
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1answer
108 views

How to get cron to delete files with names starting with foo and file extensions ending with bar? - done with php script

I'm sorry to post such a question but honestly, I've spent hours reading posts and still it doesn't work... Also if this should be posted else where but this felt like the right place. I have a ...
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1answer
5k views

Root Cron Won't Run Script (permission denied)

I've edited my root cron tab to periodically execute a script located in a particular user's folder using this command: sudo crontab -e When cron runs the script, this is the output: sh: 1: ...
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2answers
5k views

Is a restart of cron or crond necessary after each new schedule addition or modification?

When I schedule a job, some seem to be applied immediately, while others after a reboot. So is it recommended to restart cron (crond) after adding a new cron job? How to do that properly (esp. in a ...
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2answers
240 views

Neither crontab nor anacron is running, how to debug?

I'm running Arch ARM on a PogoPlug and want to execute a file every hour, the file when call directly runs fine (it is executable), for testing the file /etc/cron.hourly/crontest contains ...
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3answers
2k views

Using notify-send with cron

I am using Arch Linux with KDE/Awesome WM. I am trying to get notify-send to work with cron. I have tried setting DISPLAY/XAUTHORITY variables, and running notify-send with "sudo -u", all without ...
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1answer
512 views

What does /etc/cron.daily/apt do?

Could someone explain what the apt script is doing in cron.daily please? I can't find any documentation on it. NOTE: I'm trying to investigate a server-server communications issue which frequently ...
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3answers
546 views

dpkg-reconfigure: not found when running in cron

I have a virtual server (debian) and the clock fails to sync from time to time (probably because i save/restore state with vboxheadlesstray). To fix this issue I run dpkg-reconfigure ntp && ...
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1answer
26 views

Are the crontabs of users linked?

Our Linux server has a community user that has a crontab for itself. The admins don't want me to schedule my scripts on their crontab because they don't want to take responsibility for my programming. ...
2
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1answer
225 views

kill process in script while writing file behavior

in my php script which runs as a cron job, I have foreach($sites as $site) { exec('./wkhtmltoimage-amd64 ' . $site . ' somefile.png'); exec('./zopflipng -y somefile.png somefile.png'); } ...
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1answer
19 views

crontab nodification is taking too much time

There are 300 processes configured in a single Linux server's crontab. if I want to stop or modify any of them, I have to comment them out (i.e. # ..cron..) for all processes. It's a time consuming ...
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1answer
81 views

Execution behaviour of cron

I want to schedule a cron so as to avoid running at midnight. I was thinking a period of 7 minutes. Now, I figured out with 7 minutes of interval, the last cron schedule for a particular day would be ...
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0answers
69 views

Create a fake read only device like file with incrond

I need to generate UUID with uuidgen (not through any function call, but external command, because processes which will read the file cannot call any APIs or external commands directly). My idea is ...
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25 views

Run Xdotool on multiple users at once

When running Xdotool on user one (cron): * * * * * export DISPLAY=:0 && xdotool mousemove 10 10 and I switch to user two for several hours, and back to user one, I find out Xdotool not ...
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2answers
4k views

sh script will not execute as root (cron)

I have the following script added to cron. If I add touch thisisatest.file to the first line it will create a file named thisisatest.file, but not execute the rest of the code. If I manually type ...
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2answers
16k views

crontab's @reboot only works for root?

man 5 crontab is pretty clear on how to use crontab to run a script on boot: These special time specification "nicknames" are supported, which replace the 5 initial time and date fields, and ...
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1answer
5k views

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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2answers
265 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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3answers
718 views

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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1answer
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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1answer
1k views

“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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38 views

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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1answer
262 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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49 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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1answer
698 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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1answer
108 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: ...
10
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7answers
7k views

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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1answer
163 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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3answers
305 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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2answers
310 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 ...
2
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1answer
114 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 ...
2
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1answer
618 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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3answers
8k views

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?
2
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1answer
360 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 ...
3
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3answers
928 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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2answers
304 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 > ...
3
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1answer
203 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 ...
3
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2answers
262 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 ...
0
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1answer
390 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 ...
3
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3answers
93 views

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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1answer
876 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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1answer
101 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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2answers
237 views

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 ...
0
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1answer
227 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 ...
0
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2answers
2k 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 ...
15
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4answers
21k views

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 ...
0
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1answer
6k views

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?