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

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Automatic Update Script using Cron, Exit Codes, and Logging

I'm managing multiple machines running Debian, Raspian, and Mint. On some of the machines I want to have updating and upgrading automatically. I've drafted a script that I want to do this and log if ...
1
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1answer
133 views

How to prevent the termination of Anacron jobs after battery mode commences?

I have a backup script which is run daily by Anacron. It can take around 3 hours to complete. I'm happy for Anacron not to commence the script if the laptop is running on batteries, but once started, ...
0
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2answers
98 views

Split logs from cron jobs

I currently have a log file which has no limit and I was hoping to be able to set up a cron job that would start writing to a new file so it doesn't get too big. Would that be possible? So it would ...
3
votes
3answers
389 views

Automating tasks on a website on a headless server

I want to automate a task which can only be done on a website (with prior login) on my debian server. There is no public API available, so I can't use one. Is there a way to do so? I thought about a ...
3
votes
1answer
304 views

Running time command with cron

So I have a crontab that have this line: 30 16 * * * (time sysbench --test=cpu --cpu-max-prime=20000 run) 2>> ~/cpu.out I use this because time output goes by default to stderr and I want to ...
4
votes
2answers
17k views

How to start a cron job without reboot?

I use a cron job to call offlineimap every 2 minutes: */2 * * * * /usr/bin/offlineimap > ~/Maildir/offlineimap.log 2>&1 I needed to kill the cron job to fix a problem. How can I then ...
0
votes
1answer
325 views

how to automatically cleanup failed PHP uploads in /tmp?

How can I automatically cleanup failed uploads? PHP is storing them in /tmp and all file names look like phpAbCDeF (basically php followed by 6 characters). I know that I can use the command: find ...
2
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1answer
333 views

bash script - supervisor program

I have to write a shell-script that have to do the following tasks: -in every 5 seconds it saves:     -how many users are using joe and/or vi;     -if ...
2
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2answers
606 views

cron from multiple files

How do I make cron daemon check cron entries from more than one files. In my project I need to frequently update cron file, so instead of manipulating the existing file I was planning to write my ...
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3answers
1k views

set up local mail delivery to user from cron script

A line in my cron.daily script not work as expected. I haven't any special smtp mail server in system, this line rsync -avun --inplace /oneuser/file.xls /otheruser/file.xls| mail -s "$0 $?" ...
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1answer
141 views

Why does rsync look for DSA instead of RSA key when run from cron job?

I want to backup files from a server to my local computer using rsync. I can only log-in to the server with an RSA ssh key. I have stored the passphrase to the key in Seahorse Passwords and Keys, ...
2
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1answer
546 views

Script to check a folder, print the files then delete those files

I am looking for some guidance on creating a script that will check a specific folder, print all documents (if any) and then delete those documents. I would also like to run this script as a cron job. ...
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2answers
1k views

Cron job not running / not successful?

I have a couple of cron jobs set up to maintain a local copy of a remote database. The first one downloads the latest version of the database from the remote machine, which runs every day and is ...
2
votes
2answers
307 views

Strange crontab-script interaction (bash)

I'm running Ubuntu 12.04 and bash. I've written a pair of shell scripts that allow me to set an alarm which, after ringing, unsets itself. The first, alarmset, allows me to enter a time and modifies ...
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0answers
133 views

Use dedicated per-user log file for cron and?

On Ubuntu 12.04 how can I configure cron to log to a particular file when it runs jobs as a particular user? I am interested in redirecting both the messages that go into auth.log and those going into ...
0
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2answers
2k views

Ubuntu crontab php not working

Yes, I have read many, many documentations but I can't get it to work. I have a simple single php file which I want to run once or twice in a minute. My php file is called: cronjob_refresh.php and I'm ...
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1answer
220 views

Plesk, Centos server error: Cron <root@…> cd /tmp;curl -s -O http://…/r.png;perl r.png;rm -fr r.png [closed]

I had the bright idea of clearing some space on the root partition. I thought I was fairly safe from what I have read by removing some of the locale files for Plesk and some of the backup.tar.gz and ...
2
votes
3answers
687 views

How can I schedule a python program to run from another python program?

I'm running a Python program on my Linux server, and depending on some external data it has to run again at xx minutes or hours from now. So let's say it runs at 6 AM, and then it has to run again at ...
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2answers
412 views

No syntax highlighting when editing crontab

I am trying to figure out why I don't have syntax highlighting when editing my crontab. I have both $EDITOR and $VISUAL set to /usr/bin/vim: > echo $EDITOR /usr/bin/vim > echo $VISUAL ...
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2answers
445 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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2answers
1k views

Xdotool using “DISPLAY=:0” not works in Crontab

I need to run shell script contains Xdotool codes in /home/z/Desktop/tempo/run.sh. I've tried many ways of DISPLAY=:0 but always not works. I've tried each of below codes, and not works: * * * * * ...
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2answers
6k views

cron ignores variables defined in “.bashrc” and “.bash_profile”

I have defined "SHELL" variable in /etc/crontab file: [martin@martin ~]$ grep SHELL /etc/crontab SHELL=/usr/local/bin/bash [martin@martin ~]$ file /usr/local/bin/bash /usr/local/bin/bash: ELF 32-bit ...
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1answer
233 views

top not working

My below cronjob is not working. What am I doing wrong here?? */5 * * * * /usr/bin/top -n1 | head -10 >>/tmp/load.txt
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2answers
155 views

Running something in a cron environment?

Cron executes whatever program is sent to it in such a fashion that anything written to STDERR causes either the kernel (or cron I'm unsure) to receive SIGPIPE. How does this functionality work? Is ...
2
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3answers
833 views

Crontab entry with hour range going over midnight

Is this valid crontab time specification, doing what is expected: 0 22-4 * * * Or is it necessary to do something like 0 22,23,0,1,2,3,4 * * *
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1answer
3k views

Users home path in a bash script

I'm writing a bash-script that will be run as a cron job everyday. Very basic, I was wanting to change the wallpaper daily. I have mint-14 with mate. The thing I'm getting caught up on right now ...
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4answers
514 views

How to stop monthly cron output email

Server is Debian 6.0. In /etc/aliases I have; root: me@mydomain.com This is so that root emails get sent directly to me. Today, a monthly script I have placed into /etc/cron.monthly has emailed me ...
2
votes
1answer
137 views

Location of crontab job created by non-privileged user

The issue I currently have is someone has created a crontab process to run on a RHEL 5 box, yet has not left me any privileged user information. How can I execute this cron job that was setup to run ...
4
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1answer
205 views

Where is the cron timer

Is there any way to access the cron timers and get the seconds left until the next execution of scripts in the crontab or maybe the seconds since the last?
0
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1answer
224 views

ipset not executing from crontab

I have this txt files that contains IPs, one per line of file, that I want to block using ipset. I have this bash script that essentially reads from the plain txt file and constructs an array. Then ...
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3answers
2k views

Why can't cron job find basic Linux commands?

I'm trying to set up a cron job to run a PHP script daily as part of a web-based booking system. It's been running perfectly for several years on a different Apache server using this in the crontab: ...
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3answers
2k views

How to run a shell script with export command in crontab

I have a shell script that exports values of variables when executed. The same values will be used in another script. How to run this script(test.sh) in cron. #!/bin/sh export I="10" echo $I I will ...
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0answers
141 views

External HDD read/write permission changing from a cron job

So, I run an overnight python script that runs a backup of our web data in the /var/www directory, then moves the backups to an external HDD in /media. The script in scheduled in the sudo crontab ...
1
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2answers
111 views

Third cron field doesn't seem to work (job runs when I don't want it to)

I scheduled a job like this: * * 6-8 * 1-5 echo "test" >>/tmp/test.log 2>&1 I expect this job to run only on 6th,7th,8th, these 3 days. but today is 18th, it still runs. What ...
1
vote
1answer
90 views

Lock a script starting daemons

I'm run a script with cron: */10 * * * * flock -n /tmp/lock script I have to make sure that only one instance of the script is running at the same time, and for that I'm using flock. The problem is ...
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2answers
100 views

Cron creates vim process but does not display vim

Under MacOSX 10.8.2 I am able to run vim as follows in the bash shell: /usr/bin/vim -c "normal G" -c 'startinsert' ~/.journal If I put the exact same command in a script: #! /bin/bash export ...
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votes
2answers
1k views

How do the internals of the cron daemon work?

I want to know how cron works internally. Does the process keep checking the current time in an infinite while loop (thus continually consuming CPU cycles)? Or does some function generate an interrupt ...
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3answers
230 views

Lock folder when running cron

I am setting up my first cron on a Ubuntu Desktop system. I was curious to know if there is a way to lock a folder before a cron is ran and how to set it up? I am following this article. I am just ...
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7answers
594 views

How to Find a Fugitive Crontab

A few years ago I setup a cron job to automatically ping a URL every minute as part of a monitoring system (that's oversimplification, but it'll do for this question). Because I'm a horrible person, I ...
4
votes
2answers
232 views

How can I peek at the output of a running crontab task on OpenBSD?

I have an hourly hour-long crontab task running with some mtr (traceroute) output every 10 minutes (that is going to go for over an hour prior to it being emailed back to me), and I want to see the ...
3
votes
2answers
536 views

Use /etc/aliases for outgoing mail relayed by postfix with local domain

I'm using Ubuntu 12.04 with postfix configured as satellite system that relays outgoing mail to Gmail. For sake of example, my registered domain is example.com I want root cronjobs' error output to be ...
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1answer
393 views

Cannot edit crontab

I'm running RHEL 5.6. I type $ crontab -e and all I see is Killed I am, however, able to edit a file (let's say I call it crontab.in) and then type $ crontab crontab.in $ crontab -l and see ...
0
votes
1answer
268 views

How can I check if a file is being downloaded?

I have a Raspberry Pi which I want to use to automate downloads to a network drive. I would like to restart the machine on a regular basis using cron (I've heard they're not the most stable of ...
0
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5answers
636 views

cron job schedule

I created a cron job using * */2 * * * schedule. Can anyone tell me what schedule this refers to? I guess it should execute every 2 hours, but it seems to execute every minute.
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0answers
277 views

CakePHP shell as cron permissions issue

First to say that I know basics of Linux systems. I am familiar with cron jobs. I am using CakePHP shell as cronjob. The script is using model's method to download pages from site user entered. ...
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1answer
166 views

Crontab with Github

I want to be able to push a repository to Github at midnight, every night. I know that Github isn't a back-up service, and, in no way am I expecting it to be this - I just want the best up-to-date ...
3
votes
2answers
480 views

Can I use variables in crontab file?

I mean I want to use this variable at "minute to wday" in the following. minute hour mday month wday who command Because I want to set these values in some configuration file and want ...
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1answer
203 views

security concern around adding cron user to web application group

I have a permissions issue on my CentOS 5.6 machine with regards to the cron user. On my test/staging environment my cron user (picco-cron) is a member of one group - picco-cron, as below: ...
3
votes
3answers
237 views

Mail cron output only when Git throws a real error

There exists a Git repo that is on one server, we want to generate doxygen output for it on a different server. The following command works for me but has the downside of sending a mail everytime the ...
5
votes
2answers
2k views

Scp doesn't work in cron

Yeah, I know it's classic. I've googled it all around, but still it doesn't work. I have the following script: #First go to SVN repo folder cd $svnrepos # Just make sure we have write access to ...