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

learn more… | top users | synonyms

1
vote
3answers
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 ...
1
vote
3answers
575 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 crmpicco-...
4
votes
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 ...
4
votes
2answers
939 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
votes
2answers
99 views

How to start a screen session from a shell script using crontab and then reattach to it?

I want to run the following shell script (launch.sh) to start/stop a screen session using crontab !/bin/bash cd ~/screen DATE_FORMAT=+%Y-%m-%d:%H:%M:%S echo --- START --- date $DATE_FORMAT if [ -...
2
votes
2answers
207 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
votes
2answers
1k 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 ...
1
vote
2answers
2k 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 ...
1
vote
2answers
914 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 https://raw....
1
vote
2answers
350 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 ...
1
vote
2answers
165 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 ...
1
vote
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 - ...
0
votes
2answers
108 views

Can't start a job with Cron on Ubuntu startup

I am trying to get a simple Python script running on startup with Cron on Ubuntu 16.04. What I did is opened cron with: sudo crontab -e and added the last line as shown in the screenshot: Then I ...
0
votes
2answers
29 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 ...
0
votes
2answers
275 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 shiv@127.0.0.1:...
0
votes
2answers
126 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
votes
2answers
110 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
votes
2answers
288 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
votes
2answers
119 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 ...
-1
votes
2answers
556 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
243 views

Logrotate not rotating on file size

According to the man page "Normally, logrotate is run as a daily cron job. It will not modify a log multiple times in one day unless the criterium for that log is based on the log’s size". So, ...
0
votes
1answer
219 views

cronjob not uploading to FTP

i have a php script that should take a file from one web server and upload it on another, when i run the script through a browser it works fine. when i use this cronjob it doesn't upload. 51 14 * * * ...
0
votes
1answer
137 views

install crontab every 10 minutes

I'm following the tutorial here on how to install a crontab every 10 minutes, but I'm running into an issue. My Cron is */10 * * * * /app/qa/dashboard/ec2/autoscaling-onesearch/manage check But I'...
0
votes
1answer
112 views

Strange timing behaviour

I need to run a CRON each 5 minutes for a specific user example.com, the script executed is a php file. File : /var/spool/cron/crontabs/example.com /5 * * * * /usr/bin/php -f /home/example.com/...
0
votes
1answer
592 views

WGET/cron downloading webcamera file

our new town doctor put a web camera to his waiting room for people to see how much crowded it is. As my mom and grandparents go to this doctor, I wanted to download the files periodically and if they ...
0
votes
1answer
107 views

Check shell Script copy Status

I have a cron script and i need to adjust it; Actually some clients are generating in a directory some files, my task is to backup that files to a tape, and i need to make a if then else cp $files $...
0
votes
1answer
482 views

Editing IPTABLES nat rule in cron job

I am sitting here with an issue: I need to switch the source interface for iptables' NAT rule at a given time. I want to basically do soemthing like this - caution: concept code: #!/bin/bash if [ it ...
0
votes
1answer
642 views

Who starts updatedb process and why it uses 700+% CPU?

I have a VPS running CentOS, and recently its CPU usage goes over 700% for two times already. It always turns out to be a process named "updatedb" (as show in the figure below). After a quick ...
0
votes
1answer
215 views

I've made a php page as a cron job, how should I format the page?

So, a while back I was looking at how to make them, got it just about figured out, and then found out with 000webhost you can only link to files in your website, and couldn't write a command line ...
0
votes
1answer
436 views

Cron unable to run shell script

I have been trying to get a shell script to run for hours using cron to no avail. I am trying to have the following bash script run every minute #!/bin/bash PATH=/usr/local/bin/ices:/usr/local/sbin:/...
0
votes
1answer
1k views

Rsyslog hangs processes

I have a quite odd problem. At random times my dovecot daemon dies and I cannot receive/send emails while the host is still up. When trying to SSH into the server to see what happened, I discover that ...
0
votes
1answer
205 views

How do I monitor resource usage of crond php scripts?

I am using a VPS which is running 5 php scripts on a minute by minute basis using cron. Each script, itself, loops to execute a mysql query then sleeps for between 5 and 15 seconds. They all ...
0
votes
1answer
357 views

crontab a bash script that is copying certain files

First I would like to say that I am terrible with scripting so this has been a true challenge for me. Any input would be great! I would like to automate an sftp transfer every 24h. If I am lucky in ...
0
votes
1answer
93 views

Crontab stopped unexpectedly

I have following entries in the crontab: 0 0 * * * /mnt/voylla-production/releases/20131111011431/script/rubber cron --task util:rotate_logs --directory=/mnt/voylla-production/releases/20131111011431/...
0
votes
1answer
896 views

How to configure in crontab with condition statement for checks

We like to monitor the NAS storage mounted on a Linux box. We only like to be notified via mail when the usage exceeds a certain number, say 80. We have only seen in Linux books where most of them ...
0
votes
1answer
285 views

Ubuntu — Application global environment variables

So I have an application I am deploying to an Ubuntu 12 server. My application has several "parts" to it: There's a web server, run as part of an upstart script There are cron jobs There are ...
0
votes
1answer
366 views

Crontab command set not working

I'm trying to set up crontab to run a shell script, but for some reason, the script doesn't get executed. I'm on system with OS X 10.8.5. crontab file 0 12 * * 1 /absolute/path/to/myscript.sh 0 15 * ...
0
votes
1answer
1k views

Can I use cron or launchd to run a bash script without being logged in?

I'd like to have a simple bash script run (regardless of whether anyone is logged in or not) akin to putting it in /etc/cron.daily/ on Linux, but on Mac OS X Mountain Lion 10.8.4. If it's possible, ...
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
votes
1answer
274 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
votes
1answer
1k 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 ...
0
votes
1answer
210 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 ...
0
votes
1answer
1k 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. ...
0
votes
1answer
494 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
votes
1answer
129 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
697 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
votes
1answer
195 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
votes
1answer
213 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 ...
-1
votes
1answer
504 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 ...