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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Failed to edit crontab (linux Alpine)

I faced with an error during cron manipulation under my non-root account. bash-4.3$ crontab -e crontab: must be suid to work properly Here is an output on id command: bash-4.3$ id uid=41532(fred) ...
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Disable cron jobs for a specific user

I have a list of jobs in the crontabs for user1, user2. I want to prevent the jobs of user2 from running. I tried listing user2 in cron.deny, but that only prevents him from accessing his crontab. ...
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cron expression day of month AND day of week, instead of OR?

Probably not, but is there any way to make DOM and DOW in a cron expression be an AND relationship? For example: "0 0 1-7 * thu" Means: At 00:00 on the 1, 2, 3, 4, 5, 6 and 7th of every month and ...
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1answer
144 views

Cron jobs on IBM i 7.1

I just found out today that on an IBM i system I am able to use SSH to get to a Unix-like terminal (AIX/PASE) and would like to use this to schedule automated tasks using crontab. Does anyone know if ...
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1answer
45 views

rsnapshot: What's wrong with my crontab?

I am using Rsnapshot for backups (Linux CentOS 6). Here is my /etc/cron.d/rsnapshot: 30 11 * * * root /usr/bin/rsnapshot nowandthen > /backups/rsnapshot_cron.txt 2>&1 15 11 * * 4 root ...
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3answers
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Running Cronjobs as per Local Time rather than Universal Time

On running dpkg-reconfigure tzdata in terminal and i get 2 different time on my machine Local time is now: Wed May 1 11:58:55 IST 2013. Universal Time is now: Wed May 1 06:28:55 UTC 2013. ...
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1answer
18 views

Centos freezes, when trying to open crontab

I'm trying to open crontab, but when i type it the whole os just freezes... I thought, maybe that's because vim isn't installed, but it is. I also checked the cron.allow and cron.deny files, but they ...
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2answers
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Bad minute in crontab?

I get the following error in my syslog: Oct 17 13:14:03 tracker cron[873]: (*system*) ERROR (Syntax error, this crontab file will be ignored) Oct 17 13:14:03 tracker cron[873]: Error: bad minute; ...
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20 views

How to create a variable in crontab for a date from last week

I am trying to set up a cron job, using a script that needs to be occasionally run interactively. So far it looks like this: 59 1 * * 1 /weekly.csh date +\%Y\%m\%d date +\%Y\%m\%d >> log What I ...
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26 views

Where is my crontab file on OS X?

Moving to a new laptop I've lost my old cron setup. I'd like to include it in my backup going forward. Where is it located?
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41 views

Loading kerberos keytab from root cron

When I run a script (see below) to load a kerberos keytab from a users cron it works just fine. Running it from root cron however a password is asked for the keytab and it aborts with: kinit: Generic ...
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2answers
1k 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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1answer
28 views

why don't cron jobs in /etc/cron.d directory appear in crontab -e?

I do sudo crontab -e and see a bunch of cronjobs. If a cron exists in /etc/cron.d but not in sudo crontab -e does that mean it's not being ran? Or is it being ran but just isn't showing up for ...
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19 views

echo does not apply a line to crontab

Want to apply this to crontab: crontab -l > nopass echo 'ALERT - Found a user without password on:' `hostname` `date` | cat /etc/shadow | awk -F: '($2==""){print $1}' | mail -s "Alert: Found a ...
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69 views

Crontab Ubuntu 14

I have a problem with crontab, I can not add new task I try to add new line * /5 * * * /usr/bin/rsync -avz /home/fm-x2/Dokumenty/pliki /mnt/share/homedir/ EDITOR="gedit" crontab -e or crontab -e ...
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2answers
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Difference between /etc/crontab and “crontab -e”

What is the difference between the crontab located in /etc/crontab and the crontab that can be edited using crontab -e?
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2answers
789 views

Why does this bash script give an error on Ubuntu but not OSX

#!/usr/bin/env sh export $NODE_CONFIG_DIR=/Users/full/path/to/script/config cd /Users/full/path/to/script /usr/local/bin/node main The script runs locally on OSX (if I adjust the paths for the local ...
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1answer
175 views

use multiple @reboot commands in crontab

I searched this website and Google but couldn't find it.. How can I execute two (or more) commands using @reboot ? What I have now: @reboot /root/website1/starter.sh What I want: @reboot ...
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2answers
451 views

Why is this cronjob not working?

I have a ruby script in ~/custom_scripts/get_all_products.rb. I want it to run every night at 04:00. Here's what the cronjob in crontab -e looks like: MAILTO="<email>" 0 4 * * * ruby ...
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1answer
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Cronjob runs before the scheduled time, what could be wrong?

I have below crontab scheduled for Saturday that falls between days 19-23, I' m not sure why it ran on 20th (Friday). Any guesses? 00 21 19-23 * 6 <command>
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123 views

Cron strange behaviour

I've got a Bash script with all the permission to be excecuted, I attach it to to a cron job, this script basically only kill and restart a specific process, the strange behaviour is that if i run the ...
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7answers
128k views

Run a command every week with Cron?

Simple question- what would a crontab entry look like for a command I want to run every week on Saturday at 8:05 AM?
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6answers
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How to execute shell script via crontab?

I have a notify.sh script that looks like: notify-send "hi welcome" My crontab notification for 2 PM: 0 14 * * * home/hacks/notify.sh However, this doesn't work. What is the problem?
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8answers
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Run a cron job on the first Monday of every month?

I'd like to run a job from cron at 8.30 on the first Monday of every month. The cron Wikipedia page says While normally the job is executed when the time/date specification fields all match ...
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112 views

Cannot write to text file from python

I have a program in python, which takes data's from system and puts them to the text file line by line. Everything works properly when I run it from terminal using: python myprogram.py Every-time I ...
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I want to run a script that will disable my touchpad

I want run a script that will disable my touchpad and it will run every minute. 1. My script is: if [ `lsusb | wc -w` == '76' ] then `/usr/bin/xinput set-prop 16 "Device Enabled" 0` else ...
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2answers
10k views

Run a cron job every 5 minutes between two times

Is there a way to specify a job that runs every 5 minutes between some start time and some end time on business days in a crontab? Update I think it's relevant that my start and end times are not at ...
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4answers
2k views

crontab still sending emails even with > /dev/null

I have a crontab (root) that runs a script and output is set to > /dev/null but I always get the emails whenever it runs. I only want to receive error emails. # Rackspace driveclient update (12pm ...
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2answers
51 views

Crontab expression for run once between time range that crosses midnight

Is it possible to come up with a cron expression that runs every five minutes between 12th October 2015 19:00 and 13th October 2015 07:00?
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2answers
365 views

View the event list of a cron file

I have a relatively complex set of cron jobs running and it would be really useful for me to ask the system for the list of the next n cron tasks that will be performed. So given a particular ...
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Execute crontab as root not working

I need to execute a backup script each night. When I execute manually, backup is done without problems, but I use sudo crontab -e and add the script there: root@SF-DES-SVN:/home/svn# crontab -l # m h ...
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1answer
68 views

Backing up user accounts in linux

Following is my steps to backup user accounts with scheduling: `sudo crontab -e. 0 0 * * * sudo tar -cpzf /backupfolder/user1_backup-$(date +\%Y--\%m-\%d).tar.gz /home/students/user1 0 0 * * * sudo ...
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1answer
87 views

Crontab doesn't run my schedule backup on Ubuntu

I created a backupfolder in my root directory. Following is my command to run a backup task in crontab -e: * * * * * sudo tar -cvpzf /backupfolder/user1_backup-$(date +%Y--%m-%d).tar.gz ...
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3answers
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Only email on cron errors for jobs in cron.daily, cron.hourly, etc

I have several cron jobs that run (in /etc/cron.daily, /etc/cron.hourly, /etc/cron.weekly, etc.) and email root@localhost with the results. I'd like to stop those emails if the jobs are succeeding, ...
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2answers
43 views

Cron expression hour 1/12

I'm looking at a system where someone added a cronjob which schedule is like this: 0 1/12 * * * doSomething More commonly, if the hours part in the schedule were */12 then it would execute every 12 ...
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1answer
241 views

Crontab scheduled backup not running

I need to have the ZIP compression happen on a different drive than the server due to limited space. Here is the command is the line I use in crontab: 00 1 * * * osmc cd ...
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127 views

Why is this crontab not working?

I'm a crontab beginner. Why does this crontab do nothing? I would like it to run the script every minute. 1 * * * * /home/android/test.sh If I just type /home/android/test.sh in the shell it works ...
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1answer
126 views

How to configure a cron.d crontab file for root

What's the procedure for installing a cron.d crontab file to be run as root? I have a script I want root to run every 10 minutes, so I installed the file /etc/cron.d/mycron: SHELL=/bin/bash ...
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1answer
152 views

Cron Error : chdir failed (/usr/share/httpd): - Using Nginx

(CRON) ERROR chdir failed (/usr/share/httpd): No such file or directory I checked the log and found the following error. Why does cron tries to change the directory? I am not using httpd. I am ...
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1answer
27 views

Cron file in cron.d isn't running at all, why?

I am unable to run my cron file stored at /etc/cron.d but it wouldn't run for unknown reasons :/ can someone please help? Content of my cron file is as follows: ...
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1answer
31 views

Trigger a command upon every `crontab -e` edit

We are using a shared Linux server account where as everyone comes and edits the crontab. Usually we take a backup like this crontab -l > `date +\%Y-\%m-\%d\_\%H:\%M:\%S.txt` Is there an ...
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1answer
172 views

scheduling with cronjob to run the php file for only one time

How do I run the php file only once using the cron jobs. i.e., to schedule task to work on 20/06/2015 10:30:00 I tried something like this : 30 10 20 6 ? 2015 /usr/bin/php ...
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3answers
1k views

From what context is a cron task executed?

I am asking this question after royally destroying a Linux box. Let me give you some background so you know where I am coming from. I currently have (well... did have) a RedHat Linux box running ...
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3answers
9k views

how to run cron jobs on GMT not local time?

How can I make cron jobs run on GMT, not local time? this is my crontab file: #m h d m wday command TZ=GMT 5 0,6,12,18 * * * ~/Documents/bash/transfer.sh my jobs seem ...
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1answer
180 views

Is crontab running old version of file?

This has been driving me crazy: I run a set of Python scripts once per hour on a Raspberry Pi. I updated one of the scripts, but even after a reboot, it still seems to run an old version of the file. ...
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2answers
356 views

How do I run a `/usr/sbin/` binary in cron?

As root I added used crontab -e to add my script. However the script uses a binary in /usr/sbin/ and I get an error about it not existing when the script runs from cron. How do I fix this?
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1answer
1k views

Set default editor for crontab -e invoked with sudo

I'm using Bash on Debian Squeeze. I just read this topic: change default text editor for crontab to vim I have exported both variables VISUAL and EDITOR to vim for normal user and for root. And this ...
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2answers
2k views

cron expression for every hour starting from specific time

Every one hour (starting from "now") I am able to schedule using this cron expression (expression) using nodejs cron-job. But I need to set cron every one hour starting from a specific time. For ...
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2answers
609 views

Cron job for moving directories older than 24 hours

Well, what I want to do is The cron should run every hour or so It should move the directories in a folder /disk1/data/ older than 24 hours to /disk2/data/ The directories moved should contain all ...
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1answer
21 views

schedule a crontab to shutdown the machine after a specific process (with PID) has finished

Say I have this process with PID = 1234 currently running. I don't know how long it's gonna take for it to finish. Is it possible to schedule a cron tab to keep checking for the status of the ...