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 Laptop shutting down on battery level bellow 8%

I've written a crontab entry that runs a script in my home directory as user. That notifies me if I forgot to switch the power brick on. This works fine. BATTERY=$(upower -e | grep 'BAT') ...
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22 views

logrotate files older than x hours

What's wrong with this rotate.conf? Goal is to delete only files older than four hours path/to/tokens/*.tkn { nosharedscripts prerotate if test `stat --format=%Y $1` -le $(( `date +%s`...
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22 views

Set sciTE as default crontab editor

I am trying to set sciTE as my default text editor, but when I run the commands below it errors. Is it possible to use sciTE as default editor in Ubuntu Mate? And how would I achieve such? test@...
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3 views

Install cronjob from file to a specific user

I have an install script that sets up a user. Using the install script, I want to apply a cronjob that gets executed by that user (myuser): 0 4 * * * /home/myuser/script-to-run-at-4am.sh I have ...
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28 views

Ubuntu, sending file through bluetooth

I want to send a file named read.txt using command: bluetooth-sendto. It works using the direct command on terminal bluetooth-sendto --device=MACADDR path/to/read.txt. I want to execute it with this ...
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27 views

root crontab not executing

I'm setting up my Debian server to backup my databases with crontab, the mysqldump utility and gunzip. For some reason, my crontab lines appear to fail, especially the crucial one: 15 2 * * * /usr/...
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Script works manually but not from crontab

I created a job (run_myjob.sh) to run an executable file (myjob) that creates a backup file every Monday morning at 06:00. The executable requires the output file name to be passed to it (including ...
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36 views

cron job on centOS 6.5

I have used these 2 references to insert a new crontab entry. redhat ubuntu I have created a new bash file and moved it to /usr/bin. That sh file has execute permissions for the root user and the ...
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102 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 [ -...
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109 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 ...
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64 views

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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17 views

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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58 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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20 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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25 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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53 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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98 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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44 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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21 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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114 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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443 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 /root/...
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941 views

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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163 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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35 views

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 `/usr/bin/...
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60 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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84 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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103 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 /home/...
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91 views

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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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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305 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 /media/SAMSUNG/backups/work/...
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159 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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184 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 PATH=/...
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222 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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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 ...
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30 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: PATH=/usr/local/sbin:/usr/...
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34 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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197 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 /path/to/my/file/...
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239 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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420 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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3k 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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22 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 ...
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441 views

Automating an ssh connection with crontab

I've been struggling to crontab automate a git push process with ssh, and it's proving tricky to setup a key with the ssh agent. Starting with a basic script to test the agent: # set paths (all ...
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249 views

automatically start netcat on localhost and remote-host and keep it active

I found this answer by @jeremytrimble on Stack Overflow which explains how you can read a FIFO file over network. I wonder if it’s possible to start these netcat commands automatically, e.g. in a ...
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306 views

Why are some of my cron jobs not sending emails?

To send emails, I use the standard configuration with: MAILTO="example@gmail.com" Here is the content of my crontab: 00 3 * * 2 echo "Internal Backup (mysql) has started!" && tar -zvcf /...
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666 views

cannot rsync via ssh from crontab

I'm having issues transferring files with rsync via ssh. If I just run rsync -avz devel@10.10.10.83:/home/devel/ $/home/user/rsync/servidor it works as expected since the public key is stored in ...
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248 views

Incron Job is not being executed

I am using incron to monitor one of my file in /var/www/html directory. output of incrontab -l /var/www/html/test IN_ACCESS /home/intel/test.sh This job is supposed to create a file in home ...
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78 views

Check for screen using crontab

Currently, I'm using Debian with the following cronjob for screen at reboot: @reboot screen -dmS app1 /home/app1 @reboot screen -dmS app2 /home/app2 The problem is, that sometimes the application ...
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9k views

How to save Crontab edits?

I ran crontab -e and made some changes, now how do I save it?
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137 views

Not able to open crontab -l

I am running crontab -l to view the crons on a RHEL server(v5.10) and getting the below error: crontab: error while loading shared libraries: libaudit.so.1: cannot open shared object file: No such ...