Crontab is a short form of cron table. It is a configuration file that specifies shell commands to run periodically on a given schedule.

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Linux - starting a visible terminal on boot

I have a C program I wrote for debian on the raspberry pi that asks the user to enter a number, 1-4 which it then stores in a configuration file. This only happens if the configuration file is ...
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Run crontab non-interactively from script

I would like to schedule some tasks on remote servers by script but am having an issue with crontab expecting to be run interactively the first time. As far as I understand crontab needs to be ...
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Working with git via crontab

I have the following shell script #!/bin/bash REPODIR=$HOME/work/repository/ cd $REPODIR var=`git fetch --dry-run 2>&1` echo $var > $HOME/error.txt I want to run my script every minute, ...
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282 views

How can I sync cronjobs from one server to another?

What is the configuration file that defines the cronjobs? I know you can crontab -e, but it points to a temporary file.
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Enabling crontab logging on openSUSE

I am trying to enable the crontab log on openSUSE 11.3. I searched the web but couldn't find how to do it. I only find information about Ubuntu. Tried editing the /etc/rsyslog.d/remote.conf file but I ...
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OsX Crontab having no effect

I am dynamically appending cron tasks to the user crontab The tasks seem to be getting adde, crontab -e looks like: */10 * * * * /bin/sh /Users/john/Kiosk/app/content/update.sh @reboot /usr/bin/open ...
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1answer
128 views

Job shows up in crontab -l but not in /etc/crontab

There is a certain job that shows up when I do $ crontab -l and I can verify that this is also running. However, the job is not listed in /etc/crontab. Say the job is /somedir/somefile I can't ...
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377 views

I created Cron but I get errors that don't really understand

I created a crontab like this: 0 22 * * 2 /bin/echo " Hello World " 0 1 * * * /bin/echo " Test" but I receive mails like this, what does it mean? Subject: Cron /bin/echo " Test" ...
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Linux - switch to “cron” user

Sometimes i have issues with cron jobs not running, and diagnosing why can be difficult. What would be useful is to switch to the same user as the cron jobs run under, so i can see if there's a ...
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1answer
203 views

Setup Crontab to work with Cucumber

I'm trying to setup crontab to work with cucumber. So far, I were able to get crontab to execute a ruby command, but not a cucumber command. This is what I have in crontab: ~/test.sh > ...
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1answer
110 views

crontab setup on Mac

I'm trying to setup a crontab on the Mac. It just simply prints the message "Hello there!" to the console at a specific time, but it doesn't seem to work. Below is what I have in the crontab: 28 16 * ...
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564 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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Mac Crontab Deleted

I was messing around with creating cron jobs and somehow I wound up deleting crontab out of /usr/bin. Does anyone know of a way that I can recover it without having to re-install multiple components ...
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2answers
2k views

I want to run an rsync command at midnight but make it stop at 8am. How can i schedule the start AND END of a command?

I want to run an rsync command at midnight but make it stop at 8am. How can i schedule the start AND END of a command? I've looked into cronjobs but that will only start at a certain time. Any ideas ...
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0answers
77 views

Crontab not wroking

I have created a script in Ubuntu. Here is the script: #!/bin/sh DISK_SPACE=`df -k | grep sda1 | awk '{print $5}' | sed '$s/%$//'` DISK_SPACE_LIMIT="58" if [ $DISK_SPACE -gt $DISK_SPACE_LIMIT ] ...
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1answer
740 views

Why crontab command is not available to me even I am root

I am using the CentOS release 6.3 (Final). My problem is that even I have logged in as a root to my centos server through ssh crontab command is not available to me . I got the following when ever ...
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1answer
43 views

two crons not running simultaniously? [duplicate]

MAILTO="" */10 * * * * /bin/bash /var/www/sym_monitor/sym_start.sh > /var/www/migrate/root_start.txt 2>&1 */10 * * * * /bin/bash /var/www/sym_monitor/stop.sh > ...
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shell script not running the other script inside it [duplicate]

#!/bin/bash value=$(</var/www/sym_monitor/man.txt) if [ "$value" == "true" ]; then ps -ef|grep sym |grep -v grep |awk '{ print $2 }'|sudo xargs kill -9; cd /var/www/symmetric-ds-3.1.6/bin; ...
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1answer
1k views

If I schedule a cron job to run at midnight, will it run at the start or end of the day?

If I schedule a cron job to run at midnight on a specific day, will the job run at the beginning of the day, or at the end of the day? For example: # Runs at midnight on 20th February: 0 0 20 2 *
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1answer
75 views

Long-lasting command in crontab

I want to put execution of my script in crontab every 1 hour. I wrote script that record stream using streamripper. Duration of each stream will be 7 minutes. Is it safe to put this in crontab? Maybe ...
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Execute a root command every 24 hours after startup

I want to execute a command as root on an Ubuntu 11.04 machine every 24 hours. This machine is not on all of the time, but when it is, it can be left on for days at a time. How should I correctly ...
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494 views

Issue in running cron jobs in RHEL5

When I try to run cron jobs from root, I am getting the following error. I am using RHEL5. Can anyone help me? [root@localhost]# crontab -e Permission denied You (root) are not allowed to ...
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1answer
888 views

system-wide crontab vs. user crontab to shutdown pc

I'm trying to shutdwon my pc at 2 am once a week. If I use the user crontab of root (sudo crontab -e) 30 2 * * 3 shutdown -h now the shutdown will not be performed. However, if I place the same ...
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Shell script works directly, but has a syntax error via crontab

I have a shell script to automate a git commit and push every night: auto_git_push.sh #!/bin/sh function automate(){ git add . git commit -am "automated push $(date +"%Y-%m-%d")" git ...
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Simple Cron task in Mac OS X Lion

I am trying the Cron facility in Mac OS X Lion, but it does't seem to work. The crontab looks like this: MacBook-Air-de-Vincent:run vincentle$ crontab -l MAILTO=bxxxxxxxx@gxxx.com * * * * * (echo ...
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Schedule a cronjob start everyday automatically [duplicate]

Possible Duplicate: Is there a way to have Linux run a command every X minutes? I want to run a command which will be synchronize my remote folder data to my local computer. command is sync ...
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1answer
6k views

Python script not running as cronjob

I have tried everything and I've seen other questions here regarding this but I cannot for the life of me run a python script as a cronjob. I've tried the following. * * * * * /usr/bin/python ...
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1answer
8k views

Linux - check when crontab file was last amended

How can i get the last updated date/time of the crontab file. not when cron was last run but instead when was the crontab file amended last
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3answers
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Why does this crontab file only run once?

I have the following crontab file: 2 * * * * /bin/date >> /home/jon/date_from_cron.txt I think this means "run every two minutes". However, it only runs once. Shortly after setting up this ...
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crontab script don't execute if console is closed

I'm using Debian 6.0.6. I edited root crontab a few days ago to add this line: 00,10,20,30,40,50 * * * * /root/Scripts/con_switch6.sh >> /var/log/con_switch_diario.log 2>&1 I'm ...
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Can Ubuntu play a video via cron job?

I'm developing a display system for a paint shop. I've set up a computer with Ubuntu to run the video and display it on a TV, running a PHP script that should update the video every hour via the ...
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Error setting up Crontab

Trying to set up a cronjob: 0 12 * * * /usr/bin/mysqldump --all-databases > /backups/mysql/`date "+%Y-%m-%d"`.sql Getting error: crontab: installing new crontab "/tmp/crontab.fuly8s":2: bad ...
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359 views

Why is this CRON failing to execute?

$ crontab -l # # m h dom mon dow command SHELL=/bin/bash * * * * * (/usr/bin/curl -s -XPOST http://internal.ip -H 'Content-type: application/json' -d 'data') $ ls -l /usr/bin/curl -rwxr-xr-x 1 ...
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1answer
3k views

Why is this cron not working?

I've made a script that backs some files up and puts them in a folder, When I do sudo /data/backups/scripts/nightlybackups.sh It works, I just want to make it a cron job so that it runs every ...
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1answer
833 views

Difference between 0,10 and */10 for crontab?

I wanted to run a cron every 10 minutes. What's the difference between the syntax 0,10 and */10?
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This weird behaviour from cronjob

I have set the crontab like this: */5 0 * * * /www/permitChat.sh and the /www/permitChat.sh is this: # We are setting the name of file # in the variable along with complete path. sFilePath=`date ...
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120 views

Crontab as other user

I am running crontab as root user: screen -S konsola -X stuff 'say hello'`echo -ne '\015'` How do I run it as the user "nobody"? Only this user has screen with given pid, thats why I need it.
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How do I make crontab generate a unique log each time it runs a job?

Here is the crontab job /usr/local/bin/python2.7 /home/scripts/script.py >> /home/scripts/logs/log.log 2>&1 How do I generate a new log every time the job is run? I am cool with ...
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Crontab crash when running a script that insert a lot of lines in MySQL

My crontab is crashing when I run a script that insert alot of lines on MySQL Database, but when I run a script that inser few lines it run properly, is there some configuration file of cron? Maybe ...
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1answer
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Are there good reasons to have a single cron job run multiple comands [closed]

How would cron handle a job that executes multiple commands. As an example I have a cron job that looks like this. Which gets very difficult to read. 10 0 * * * firstscript.sh > first.log; ...
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1answer
191 views

crontabs hour specification */1 is that the same as *

I am looking for clarification with the cron tab that I am working with. some job 1 * * * * some job 1 */1 * * * Are those jobs the same? The job will run the first minute every ...
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1answer
902 views

Is there a way to predict the next execution time for a crontab job?

I'm configuring crontab jobs on an Ubuntu server and I'm trying to figure out how can I predict the next execution time for my jobs individually. It's just a matter of making sure I configured the ...
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5answers
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randomised cron command

I'd like to write a cron command so that a job would execute once at some random time during the week - is this possible without having the crontab modify itself? I've considered writing a function ...
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3answers
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Load login shell inside user cronjob

I'm trying to run a rake task using a scheduled cronjob. My crontab looks something like this: 0 1 * * 1-7 /bin/bash -l -c "cd ~/jobs/rake && rake reports:create >> ...
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1answer
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Mac OSX 10.6 Cron Job Not Running

I tried setting up a crontab on my Mac, but it's not running for some reason. Here's what I'm trying to run: */2 * * * * /BackupScript/backup.sh I have it set to every 2 minutes currently for ...
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Why cron saves at /root, when should at /var/www?

Why my cron */1 * * * * /usr/bin/php /var/www/query/query.php &> /root/querylog.log saves query.php output in the /root/ folder? (this script shall save *.txt at its location) It should do so ...
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1answer
1k views

sudo access to view/edit a crontab

I wish to be able to edit, or at least view, a crontab that is on a server. Should I not be able to run this to do so: sudo crontab -u root When I do, I get this error: Sorry, user crmpicco is ...
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2answers
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Issue pushing file from linux to windows with smbclient

I have a file located on my linux box that is generated by a python script, the file is dropped inside of the /root/ directory My bash script looks like so: #!/bin/bash # Run the HR Data feed cd ...
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How do I make cron run a Java GUI application?

I have a script which runs a Java GUI application using "java -jar app.jar". I have added the script to the crontab to run every minute, check the processlist if the application is up. If it isn't it ...
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Why does cron task run twice?

I have a task that should run each day in Ubuntu10.04. So I use crontab and copy the scripts of the task to the directory /etc/cron.daily. Here is the my crontab: # /etc/crontab: system-wide crontab ...