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

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77 views

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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3answers
537 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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2answers
855 views

Shell script of mysqldump works fine when run manually, but does not run in the cron job?

I have a shell script to get a MySQL database dump. This script works fine when run manually #!/bin/sh fqn=/home/Mysqluser/daily_dumps/bookstore_`date +%Y%m%d_%H%M%S`.sql.gz mysqldump -u root -h ...
3
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2answers
4k views

Linux startup script to connect to bluetooth and cron to keep it connected

I have a mini Bluetooth keyboard and a Raspberry Pi running a Debian-based distro. I know the MAC address of the keyboard but for this question, let’s just use AA:BB:CC:DD:EE:FF. Right now I have to ...
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2answers
176 views

easy way to automatically retrieve image for desktop background?

I would like to automatically download and replace an image from the NASA website to use as my desktop. in linux i used a cron job to do this, using wget to retrieve the file and a small utility to ...
2
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2answers
939 views

What are the limitations of crontab?

Hardware considerations aside, are there any limitations on: The maximum number of cron jobs that can be scheduled for a single user The maximum number of CONCURRENT jobs that can be scheduled for a ...
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2answers
627 views

Crontab command cannot be executed. Error PAM configurations

Here's the command that I would like to execute but it seems not to work. [mdubois@veloce ~]$ crontab -l Autorisation refusée You (mdubois) are not allowed to access to (crontab) because of pam ...
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2answers
477 views

Crontab + Forever + node.js + NPM

I cant put my crontab to work. I'm on Ubuntu 14.04x64 So, this is what I did: .root .pw .sudo apt-get update .sudo apt-get install nodejs .sudo apt-get install npm .curl ...
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2answers
302 views

Restarting process in CentOS if server restarts

I have a VPS with some Java applications (made with "Play Framework") running on ports 9000, 9001, 9002 and 9003. VPS Provider (iPage) happens to reboot servers unexpectedly from time to time, leaving ...
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2answers
5k views

How to auto commit to my git repository using cron?

I look into a lot of answers about this subject, but something is wrong here, let me explain. I create this script, to make my cron cleaner :) #!/bin/bash cd ...
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2answers
158 views

Rsync to take the newest file. And a cron job?

I have a log file on two different servers. The servers are under a load balancer so half the traffic goes to one server, and half the traffic goes to the other server. I need to take the newest log ...
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2answers
26 views

Install cron from console

Is there any way to do the crontab -e, save and exit from vim from the console directly? I realised that in order to make cron work with Docker, I should do crontab -e and save and exit, that is the ...
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2answers
252 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 ...
0
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2answers
115 views

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 ...
0
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2answers
93 views

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 ...
0
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2answers
179 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 ...
0
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2answers
116 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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2answers
1k 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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2answers
531 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 ...
0
votes
1answer
79 views

Run command in cron

I'm trying to execute the command "redshift -l 33.8683:151.2086" at boot on my ubuntu system. The program works when run in a terminal so it may be sensitive to having the right runtime level. I've ...
0
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1answer
1k views

How to resolve Win32 error 1069 when starting cron under cygwin?

The machine runs Windows 7 Home edition. I'm trying to use rsync to backup files to a linux box. The rsync command runs fine in cygwin. I resolved an earlier error by running the cygwin terminal as ...
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1answer
244 views

Cron Job Command To Delete 0 Byte Files

I need to have a Cron Job, that when it runs automatically deletes all of the files inside of a folder that are exactly 0 bytes. The script I am using allows users to enter their username so it ...
0
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1answer
891 views

What time does cron.monthly jobs run in SLES?

doc says cron.monthly will be scheduled according to the first run time and it compares /var/spool/cron/lastrun/cron.monthly with current time to run. Question is will it run according to the ...
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1answer
189 views

Cronjob using the mail function

When I run this mail command from the terminal, there's no problems: mail -s "Test Mail" user@example.com < home/user/example.txt When I add it to a bash script that mainly does this, there's no ...
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1answer
837 views

Make crontab work at 0 hour

I try to execute some command like this: */10 0,1 * * * $BPY some_script.py Meaning I want to run it every 10 minutes between 0:00 and 1:00. BUT: I see in my /var/log/cron that it is not executed. ...
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1answer
459 views

Crontab No such file directory

I'm trying to run an hourly python script. My crontab looks like this: crontab -l 0 * * * * "/common/.../www/concat.py /common/.../www" as an output I get this: /bin/sh: /common/.../www/concat.py ...
0
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1answer
120 views

In OS X Lion under zsh, how can I set up a /Users/username/tmp directory which deletes after X days?

I'm new to scripting and regular jobs on OS X, so appreciate the help in advance. I'm looking to have a tmp directory in my homedir, as in /Users/username/tmp which I can use as my "downloads" ...
0
votes
1answer
669 views

Restart Solaris 10 SMF service automatically each day

I am currently facing the problem how to restart a SMF service automatically each day at a specific time. The simplest solution probably is to use cron. Currently my main objection is handling "lost ...
0
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1answer
192 views

Scheduling Cron Jobs Without Colliding Frequencies

If I have several cron jobs that run: Every minute Every 5 minutes Every 15 minutes Every hour At midnight Then at exactly 00:00 I have 5 jobs running at the same time. I want to add another job, ...
0
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1answer
212 views

bash, mirroring of multiple directories (hard linking)

I have 5 FTP users that upload files (and subdirectories) in their home directory, i need to mirror theese directories beetween them and with a "master" directory (accessible from a 6th user). Files ...
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1answer
373 views

Double pipe “||” not working in cron jobs

fellow SUers, I am trying to run a watchdog cron job to make sure a process is running (DreamHost keeps killing processes). I was inspired by this SU question. However, the double pipe || seems not ...