cron is a task scheduler based on clock time that runs on Linux-based machines.

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Prevent users from using the same cron schedule?

I've a lot of users in my server using exactly the same cron schedule and this is causing high server load. Can we prevent this? For example, if there's x numbers of users that use the following cron ...
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365 views

cannot access crontab with sudo after being added to /etc/sudoers list

My user "craig" is in the /etc/sudoers file on my CentOS 5.6 VM, however when I try to access the crontab using the command below I am presented with an error message: sudo crontab -e -u ...
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98 views

crontab is not working

I am using Linux Fedora. I want to create a crontab with SCP command, but it's not working. [shiv@db2 ~]$ crontab -l #this is server to server copy... */2 * * * * date >> ~/$ scp ...
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How can I get a script to run constantly on Mac OS X?

I would like to do this: When the application VLC is open and I press the space bar, it pauses the video and an itunes starts to play. Then spacebar again would resume the workout video and pause my ...
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49 views

Using cron vs. system managed service for frequent tasks

If some task should run in an frequent but not neccessary precise manner, what would the benefits of using cron vs. just using a service (eg. managed by upstart) with a loop script like #!/bin/sh ...
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107 views

crontab email is not working as expected. First I got the emails at gmail, now I'm not getting them

First I ran a simple test to see if I could get crontab to send me an email. I created the following line: MAILTO = my_email_address@example.com 1 * * * * /bin/echo "foobar" This worked as expected ...
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979 views

RHEL6 Crontab doesn't work properly?

In RHEL6 root's account I have crontab job: 30 6 18 4 1 /sbin/init 6 It worked fine on the 18th of April and properly restarted my system, BUT it also restarted my OS at 6:30 on next Monday - ...
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What is the risk when editing crontab file without the “crontab -e” command?

I developed a script in which I add lines to the crontab file with echo command and I remove lines with sed command. I do not know the risk of that especially that I find in some web site that we ...
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443 views

cron uid:gui for every username

So in the nutshell : There was user John with 502:502. After i deleted John and recreated him, his UID:GID changed to 504:504. Cronjobs are still running under the John's crontab, but when the ...