Cron is a job scheduler that allows users to run commands periodically.

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Setting anacron on mac

I set cron to run script every day using env EDITOR=nano crontab -e where I wrote something like this @daily path/to/sript.script Now I want to use anacron to be sure that script is going to be run ...
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856 views

How to respawn vpnc when it stops?

As root, I've setup a crontab rule that launches vpnc everyday early in the morning (before I arrive at my workplace). But it often occurs that the vpn stopped mid day. As a result, I have to sudo ...
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56 views

Run this PHP file via Cron Job

Here is the script: <?php //Create back files? define('CREATE_BACKUPS', FALSE); if (!is_dir($argv[1])) { echo "You must enter a valid path such as /home/apresv/public_html or ...
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59 views

Bash script not working with crontab

I own a raspberry pi that runs raspbian jessie. I'm using this raspberry with motioneye as a system surveillance. Motioneye records files to a sd card but i want to delete older files in folder ...
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269 views

Arch Linux - How to run a cron job?

I am on Arch Linux and I'm trying to make a cron job that fires every minute. So I use: $ crontab -e And add the script in: * * * * * Rscript /srv/shiny-system/cron/CPU.R ~ ~ "/tmp/crontab.8VZ7vq" ...
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2k views

crontab exclude specific date only

How can I write a cron that will exclude a specific date. let say : I need to run a crontab 6pm to 9pm in every 30 min on weekends and want to exclude 10th may 2014 only. Is It possible? How can I ...
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1answer
10k views

cron midnight 00 24 or 00 00? [closed]

My current crontab looks like this: 00 00 * * 1-5 "/home/user/script.sh" But it seems like it is not being triggered, all others are triggering fine except the one running at midnight. What is the ...
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28 views

Executing MySql stored proc in Crontab [closed]

I have a MySQL stored proc named "item" and I want Cron to run it for me - in server of course. I'm avoiding using MySQL events to unify all my 'jobs' - backup,etc. Any how this is what I did in my ...
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Crontab not running a shell script

Using account alex, I created: ~/pocketmine/pocketmine.sh When I manually run this using the same account, alex: cd pocketmine ./pocketmine.sh start It runs fine. I have added this to ...
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13k views

How can I check if my cronjob is runnning on my server via PHP?

I would like to give out a warning If cron is not running or if a certain cronjob is not set in crontab on my server. Is this possible to check with php?
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41 views

$PATH variable for CRON in OpenSuse

I have a script written which works perfect on terminal however gives error when called through crontab. It took me a while that the problem is with the cron environment not my script. so I tried ...
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12k views

How to add unique id to file name in cron job?

My cronjob looks like this: 5 3 * * * mysqldump -u root test > /srv/backup/mysql_daily.dump How can I make filename unique for every time when cronjob writes mysql_daily.dump?
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40 views

Can I move 0yum-cron from cron.daily to montly?

I installed the yum-cron package, configured too only check for updates and then mail me. But, doing this daily, seems a bit too much. I would like to do this monthly. The file is located in ...
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1answer
37 views

Cron Job Hourly Except Certain Time Frame on Friday

I want my cron job to run every hour, every day except Friday when I don't want it to run at all between the hours of 2am-9am (but hourly outside of this timeframe). Ideally, I'd like to have this in ...
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Crontab -e @reboot script doesn't start on restart

I add a string to crontab -e @reboot /home/user/start-ethminer.sh > /home/user/start-ethminer.log 2>&1 My /home/user/start-ethminer.sh file has the following content: #!/bin/sh screen -m ...
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1answer
57 views

script Multiple Commands

I have a PHP script I'm running from Cron. I want to save its output to file, but also want to save the shell output to a different file. Ideally, I'd like to have this in one line. As such, I tried ...
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39 views

Crontab and screen at reboot

I try to create a cron command that execute a software in a screen during start-up on my Debian. It seems easy by doing this command but it doesn't work (no screen created during start-up): ...
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48 views

User cron jobs are not being executed any more (perhaps SELinux)

I have the following output as a user running crontab -l: #Ansible: backup-external chaos */20 * * * * flock --nonblock /home/mu/.cache/backup-external.lock backup-external chaos */20 * * * * ...
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184 views

Pg_dump does not work in Cron

I have the command below and run it succesfully: /usr/lib/postgresql/9.1/bin/pg_dump -U dspace --format=c --file=/dspacebkp/dspace_db_$(/bin/date +\%m\%d\%Y)_uncompressed dspace I can see my new ...
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64 views

use find command in bash file

I am using this script in my Linux machine to find all files that were modified yesterday: #!/bin/bash find /home/*/domains/*/public_html/ -name "*.php" -mtime -1 | while read line; do echo "$line" ...
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4answers
1k views

A gzip process regularly runs on my system, how do I figure out what is triggering it?

For a while now, I have had the problem that a gzip process randomly starts on my Kubuntu system, uses up quite a bit of resources and causes my notebook fan to go crazy. The process shows up as gzip ...
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2k views

Do spaces matter in a crontab

It's not clear to be from the manpage for crontab. IS extra white space allowed between the fields? e.g., if I have this: 1 7 * * * /scripts/foo 5 17 * * 6 /script/bar 31 6 * * 0 /scripts/bofh is ...
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2answers
37 views

Script not running! Also how to attach timestamp in mail?

I have the following bash script... #!/bin/bash # Delete JUNK temp folder if [ -d JUNK/FOLDER/PATH ] then rm -rf JUNK/FOLDER/PATH echo "Cleansed JUNK directory successfully!" /usr/bin/mail -s ...
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9k views

Why isn't this crontab job running

I have a cron job that runs every minute on an Ubuntu 12.04 box $sudo crontab -e * * * * * mylogin /pathto/file.sh > /log/filelog If I run file.sh, the bash script does some stuff and echos out ...
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31 views

broken cron job after editing it

I'm having some difficulties on understanding why the following cronjob does not work anymore: 30 3 * * * /path/to/backup_script.sh && tar -czvf ...
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4answers
532 views

crontab not running for Fedora 23

UPDATE 2 This is a documented issue in Fedora 23. I used the workaround listed here https://bugzilla.redhat.com/show_bug.cgi?id=1263328. It looks like it is working. UPDATE I set selinux to ...
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30 views

Is it possible to have cron restart itself each day?

The reason I'm asking is under certain conditions I would like to change the email addresses that cron sends email to. For example I have database of who is on vacation so I would like to remove ...
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2k views

Suppress output unless non-zero exit code

What's the best way to suppress output (stdout and stderr) unless the program exits with a non-zero code? I'm thinking: quiet_success() { file=$(mktemp) if ! ( "$@" > "$file" 2>&1 ); ...
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34 views

How to set the path for one cron command

I had programmed a cronjob to restart a service with an apparent memory leak weekly and got an email saying that the killproc command wasn't found. That's in /sbin/killproc and I don't want to ...
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Cronjob python script

I have a python script that parses some html and then writes it to output file. I want that cronjob would execute that python script. When I run this script from command line it works fine (python ...
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39 views

Control character handling in cron/mailx

I have a cron job which runs a long script producing lots of output. Some of the output is lines delimited by single carriage returns; when run from the command line, these make the successive lines ...
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How to start cron in Linux Mint 17.3

How can I start cron at startup of computer, so I can use a cronjob to automatically make a backup using rsync. I am not well known with how to start programs in Linux. I am using Linux Mint 17.3.
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24k views

Manually run a cron job / simulate running cron job?

I am new to cron and I want to test if cron's mailing stuff after an executed task and things like that work. Is there a more elegant way to test this, then setting a cron job to run every few ...
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3answers
776 views

Is it possible to have a cron job run more frequently than once every minute?

CentOS 6 I have a shell script that performs a task every minute. The task itself only takes a couple seconds to complete and ideally I'd like to have this shell script execute 2-3 times per ...
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Need some assistance with anacron in Ubuntu

I've got Ubuntu 14.04 I try to learn about using anacron. And there're 3 things so far that I can't understand. Please explain! WHEN is the anacron command (tast) executed for the FIRST TIME? Let's ...
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32 views

Deleting a file after X days does not work [duplicate]

Ive tried multiple ways of writing this and im executing the script myself so it isnt the crontab that isnt working. These are examples of what ive tried : find /home/backups -mtime +1 -exec rm {} \; ...
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23 views

which programs benefit the most by cron (for a SOHO user)?

I understand that cron is basically a job scheduler. Apart from doing $sudo apt update which I like/love to run manually as it's uncertain when my bandwidth will be free for running the update, I ...
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Centos7 crontab @reboot sleep not working

I am currently trying to get my server to relaunch a few things on server reboot but they were failing due to screen not yet being loaded (I believe), in an attempt to fix this I added a 3min sleep to ...
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2answers
79 views

Is it evil to link to a crontab?

I think about doing something like: sudo ln -s ~/myCustomCrontab /var/spool/cron/crontabs/username because I'd like to have all customized files in my home directory. Possible risks I can think of ...
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3answers
19k views

How can I execute `date` inside of a cron tab job?

I want to create a log file for a cron script that has the current hour in the log file name. This is the command I tried to use: 0 * * * * echo hello >> ~/cron-logs/hourly/test`date "+%d"`.log ...
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25 views

How to update crontab for a user with a script without duplicating comments

So I've noticed that I've dumped a lot of annoying comments in the top of quite a few crontab files by using crontab -u user -l > /tmp/crontab.user #muck with the file crontab -u user ...
2
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1answer
112 views

How to run a script in a screen on reboot

I want to start a blocking server in a screen on reboot, so that I may access it later. The command screen -d -m /home/dataserv/www/start_production_server.sh works on its own just fine regardless ...
0
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1answer
51 views

Why doesn't `date +%F_%T` work in crontab? [duplicate]

When I use time and date at the end of a crontab line like backup`date +%F_%T`.sql or like backup`date%d%m%y`.sql, my crontab command doesn't work. But when I remove it, it works perfectly. Why ...
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23 views

Linux Mint 17.2 encounters an error, remounts disk in readonly

I already posted the question actually (Linux Mint 17.2 suddenly loses write access to filesystem), but since it occurs rarely I need to ask again with some new info I gathered. I suspect that this ...
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ubuntu Crontab not running properly

I have to run crontab in xvfb display mode forever when the system restarts...below is crontab code.... @reboot nohup Xvfb :1 -screen 0 1024x768x24 & export DISPLAY=":1" @reboot /usr/bin/forever ...
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219 views

How do I format these two complex cron statements?

I need two very specific cron statements: A cron entry that would run on the 2nd Monday of each month every 4 hours beginning at 02:00 and execute the file /opt/bin/cleanup.sh A cron entry that ...
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1answer
68 views

Access to user's session D-bus from their cron commands

What is needed to give cron commands access to the session bus (if it is running)? It used to work for me, on Debian Stretch (testing) since switching systemd until relatively recently (might have ...
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1answer
39 views

setuid.today date format changed after FreeBSD 10.2 update

My setuid.today has a different date format than setuid.yesterday: setuid.today (German localization?) 3 Dez setuid.yesterday Dec 3 I'm getting emails with the diff reports every day. I guess ...
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1answer
95 views

Boot computer on schedule 2 times per weekday [duplicate]

My setup: I use Ubuntu 14.04 to perform a range of tasks. These tasks are performed whenever I execute a bash script. When it has finished the tasks the computer is automatically shut down (I don't ...
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dstat not installed with cron

I have an auto install bash script triggered by cron, when some condition is met, the install process is triggered. It essentially looks like this: #!/bin/bash if [[ -f "/usr/bin/apt-get" ]]; then ...