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

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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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58 views

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
62 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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49 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): root@xxxx&...
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1answer
66 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 * * * * /home/...
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390 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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71 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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2answers
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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45 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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11k 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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33 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 /path/to/archived/backups/...
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1answer
35 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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2answers
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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2answers
43 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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43 views

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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2answers
52 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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2answers
171 views

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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3answers
25k 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 seconds?...
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3answers
812 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 minute....
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1answer
46 views

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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2answers
24 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 don'...
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137 views

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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107 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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22k 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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1answer
34 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 /tmp/...
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1answer
162 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 ...
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1answer
60 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 doesn'...
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1answer
24 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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59 views

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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229 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
136 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
48 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
131 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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30 views

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 ...
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3answers
54 views

script not running as expected when scheduled as a cronjob

I'm trying to write a script that will identify corrupt jpg images using imagemagicks identify command. The script will run the command, grep the output for the word "Corrupt", move it to a corrupt ...
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138 views

Issues with a cron script

I have a shell script which does following: Do a scan on websites (URLS coming from all_hosts.txt), Get json reponse which is saved in file (outputscanner.txt) Run a json parser (jq) on above file ...
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1answer
36 views

handle large number of same log using cron or logrotate

We have an app deployed in a server, which, under some scenarios, generates some logs in the below format. process_name.hostname.common_text.log.{error/info/warning}.date.time Now, due to this ...
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2answers
45 views

Executing a cron 9 to 5 and at midnight

It's simple for the ones who understand it but for me most of the times it's a big puzzle. I want to execute a PHP script 5 minutes after each hour from 9 to 5 and i want to run it once more 5 ...
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1answer
97 views

Jobs not working in cron, but working manually

I have gone through similar posts in this website, but none of them is matching my query. I have the below content in my crontab, but it is not working. * * * * * perl sc.pl And when i'm trying ...
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1answer
38 views

Gnome Schedule cannot run hdparm

I have set up a cron job that should execute hdparm -y /dev/sda >> /var/log/diskspindown.log 2>&1 When testing it running it via "Run selected task" it executes fine and logs /dev/...
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1answer
33 views

Run certain script periodically at boot time

Suppose the computer is being launched irregularly. And I want to run a certain script at boot time once in a month. But I can't setup a cron job as I don't know whether the machine will be booted at ...
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64 views

cron not running rsync

I'm trying to setup a rsync task using cron. The point is to sync a work folder on a linux partition and its counterpart on a windows partition on a dual-boot computer. To do that, I'm trying to ...
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1answer
34 views

No indication of attempt to run cron job

I am running the latest Sentora version on an Ubuntu 14 server. I created a cronjob which should run every five minutes but there's no indication of an attempt to run the cron job. I have tried to ...
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1answer
20 views

Correct cron format

So I wanted to execute two commands every every week at beginning of Friday 12am and Sunday night 11:59pm before it turns Monday as I want this to be turned on from friday-sunday night then again next ...
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1answer
46 views

Run minecraft from script in cronjob

I tried making this command run at 10:20pm and then the second at 10:21pm but nothing works. I tried as root and as minecraft user but nothing. How can I get it to work? 20 10 * * * screen -S classic ...
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21k views

Running a script during booting/startup; init.d vs cron @reboot

I am currently trying to understand the difference between init.d and cron @reboot for running a script at startup/booting of the system. The use of @reboot (this method was mentioned in this forum ...
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2answers
8k views

Run a GUI program at startup

I am using Ubuntu 14.04. I wrote a small script named trial. The contents of the script are as follows: #!/bin/sh SHELL=/bin/sh PATH=/bin:/sbin:/usr/bin:/usr/sbin sh -c firefox I copied the ...
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1answer
133 views

Notify-send doesn't work at Cinnamon

I am using Linux Mint 17. I want to be informed every 50 min, at every hour for small break. Here is cron job: nazar@lelyak-desktop ~ $ crontab -l DISPLAY=:0.0 XAUTHORITY=/home/matrix/.Xauthority ...
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91 views

crontab doesn't work corectly [duplicate]

I want to make some notification to user every day at the same time: any_hour:50 And I wrote to crontab -e: 50 * * * * DISPLAY=:0 /usr/bin/notify-send -i /home/nazar/Pictures/icons/...