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

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309 views

command not running in cron (systemctl suspend)

I have this cronjob set : * * * * * /usr/bin/systemctl suspend And it is not working. But I can run it in a shell and it works. I don't understand what could be not working. EDIT Redirecting error ...
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1answer
117 views

Why does OpenSSL automatically send me Terminal mail?

I for some reason am getting messages from OpenSSL constantly (not literally constantly, but every hour or so) sent to my Terminal mail box saying: Message 1: Subject: Cron ...
4
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3answers
1k views

Cron allowed special character “L” for “Last day of the month” on Debian

I'd like to know if L is one of the allowed special characters on Debian's cron implementation? I'm trying to set up a cron to run on the last day of every month. From the cron entry on wikipedia: ...
4
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2answers
494 views

Cron to not run on specific day but all other days

I have a cron setup to execute a bash script daily at 10pm. I have another cron setup to run monthly on the 1st of the month. Both crons launch a bash script, and the only different in the bash script ...
1
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1answer
106 views

Get system notification at a certain time?

Is there a way, in Linux or FreeBSD, to receive notification from system at a specified time? I'm thinking something in like of what inotify in Linux does for filesystem events. There IS a way to ...
3
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2answers
459 views

setting a cronjob in IST time

I am trying to set a cronjob run in a different timezone. I've googled a lot and found editing /etc/default/cron is the way to go. But this file is deprecated and I see the following message, so I ...
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0answers
30 views

Is there something as flexible as crontab for user-level autostarts? [duplicate]

I'm looking for a flexible per-user initialisation tool to kick off user daemons when the system (re-)boots. I suppose something similar to crontab would be great, which works for every user ...
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1answer
154 views

How to figure out what is performing scheduled server reboots?

I'm helping a friend with a server and it appears the server reboots every week on Sunday night. How can I figure out what is causing is the server to reboot? Aside from rebooting, the server appears ...
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2answers
366 views

Run a cron job every minute, meaning of syntax [duplicate]

I read somewhere that you can add a cron job to run every minute like this: #min hour day month weekday command */1 * * * * <your command> What does the /1 part mean? Can I ...
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3answers
744 views

Custom crontab does not work (FreeBSD)

I created file crontab.custom with: */1 * * * * /home/username/data/www/run.sh And run.sh contains: php script.php After this I run this command crontab crontab.custom. Now crontab -l ...
2
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1answer
500 views

How to add crontab in FreeBSD

I am trying to add a job to my crontab in FreeBSD but it is not working : I have used this to add the job: sudo crontab -e -u vaibhav @daily /home/vaibhav/applications/comparison/scrapy but it is ...
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1answer
111 views

Script to restart the application

I need to write a script for the below scenario in Linux: Run a cron every 5 minutes. grep the application log file to see if we can see the pattern "ORA-". If we see this pattern: stop the ...
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1answer
145 views

Launch 2 celery processes via cron

I'm trying to chain some commands to periodically check/launch two processes via cron (I'm on a shared host, can't change things around). After a lot of googling around, all the things I've done don't ...
7
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1answer
520 views

How to autostart a background program by a non-root user?

As a non-root user, I want to run a background job when the system boots. It's sort of a service which doesn't require root privilege. Is there a way to do it? One way is to put sudo -u user command ...
1
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1answer
494 views

Cron automated bash script to run run 1 bash script then another, plus integrity check

So I have a custom in-house app developed by a 3rd party. When the app is running, I can verify it is running with the "screen -ls" command. As long as screens are running for rails and freeswitch ...
3
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1answer
842 views

Cron job still running when deleted

On a server I inherited, there is a cron job running hourly on one of the Debian servers. It sends an email out to a non-existent email, but bounces back to my account since I listed myself as the ...
2
votes
1answer
104 views

Executing 'ssh-add -D' from a cron job doesn't work

I've set up an openSSH server on an ubuntu-server machine, and I configured it to use public/private key (without password). I want to require both password and key check when the client connects to ...
1
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1answer
869 views

Pimp rsyslogd to have less i/o (cron, pam,…) and less logging

On my raspberry I really don't need crons and pam logging and I want to have less i/o to make the SD card life a little longer.. I have already removed cron with the second line cron.none, I'm ...
2
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1answer
265 views

systemd - Timer units that mimic anacron behaviour

I need to write a timer unit for a machine which is turned of frequently (e.g. classical desktop setup). This timer unit needs to be activated regularly but not very often (e.g. weekly, monthly). I ...
2
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2answers
291 views

Stop cron sending mail for backup script?

I have set up a backup script to back up world data on my Minecraft server hourly using cron, but because the worlds being constantly edited by players, tar was telling me that files changed while ...
2
votes
3answers
978 views

Solaris: how to forward cron e-mails?

If a cron job produces output it is e-mailed to the user's account. I would like to redirect this e-mail to another e-mail account. Preferably on a user-by-user basis. I've looked into some options ...
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0answers
26 views

Script executed from cron doesn't display GUI notifications [duplicate]

The script below has the name notifyrssh.sh. 1: File=/home/vaios/Desktop/tempcron/liveusers.txt //OK 2: cd /home/vaios/Desktop/tempcron 3: ps -aux | grep sshd > ...
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0answers
112 views

Scheduling cronjobs at specified time

I have scheduled some jobs in crontab which are to be run one by one, at some specific time. My script for crontab is : 15 10 * * * /Users/sri/files/BatchFF.sh 45 11 * * * /Users/sri/files/BatchGC.sh ...
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2answers
4k views

Run a sudo (or startup) python script from cron on a Raspberry Pi?

I'm helping out with an art project (http://stargateeggbeater.com/ for those interested) built on Raspberry Pi. The RPi controls an addressable LED strip through the GPIO, using the spidev device per ...
1
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1answer
105 views

How can I create cron jobs in specific files?

I want to have a separate folders for cron jobs like: /mydata/cronjobs Now in that folder I want to have files like backup_server which will have the content like: 30 3 * * 1-5 ...
4
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1answer
664 views

How is cron scheduling actually implemented and makes sure scripts run on time?

I want to ask about cron jobs. OK, we place the scripts in the crontab and the cron daemon executes them. Now if I understand this, each minute, cron checks the crontab of each user and executes the ...
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2answers
3k views

What are the permissions of a cron job?

When a cron job runs with what privilege does it execute? I'm not sure about that. Is it with the same privileges of the user that added it via crontab -e?
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1answer
158 views

Deadlock in a crontab between cron and its child defunct processes

I'm having a strange case of deadlock, where the two processes launched by cron are defunct, but cron does not pick the return code and exit. I don't have access to the root user. myuser@myserver:~) ...
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4answers
2k views

Crontab not working

I'm trying execute a basic shutdown crontab to run M-F at 10PM. So I did the following: sudo crontab -e Once inside of the crontab I added the following line: 0 22 * * 1-5 shutdown now The job ...
3
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2answers
401 views

Cron jobs and mail notification

I have (from one tutorial) cron job which make weekly backup on my website and is working fine. #!/bin/bash NOW=$(date +"%Y-%m-%d-%H%M") FILE="mysite.com.$NOW.tar" BACKUP_DIR="/home/user/backups/" ...
2
votes
4answers
2k views

How to display a (zenity/GUI) dialog to the user after a root cron task has completed

I have a simple periodic cron task that must run as root. I want to use Zenity (or similar) to display a GUI informational dialog to user 1000 (or logged in user or all users) when the cron task ...
3
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2answers
132 views

Cron job for every minute executing out of order?

I'm setting up some shell scripting to be executed every five minutes, then every minute on our client's system, to poll a log and pull some timing information to be stored and accessed by another ...
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1answer
79 views

Cron job doesn't seem to be executing in ubuntu

I have a script located /myscript/script.sh and I have a cronjob that I submitted like this: sudo crontab -e The contents of the crontab are as follows: */1 * * * * ./myscript/script.sh The ...
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1answer
221 views

Why do I get different outputs when running my shellscript manually from when I run it with cron? [duplicate]

I have a fairly simple shell script (foo.sh) that looks like this: #!/bin/bash echo -n "$USER,$(date)," `binary -flags | sed -e '1,30d'`; exit 0; This script is supposed to prepare some output ...
2
votes
1answer
75 views

Running services without sudo

I want to run a nodeJS web server on a couple of machines which I don't have sudo access on. What would be a good way to do this? The two requirements are: running the service without being ...
3
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1answer
164 views

Cron job results are different from executing from own shell

I am using Ubuntu 12.0.4 I have a script basically with the following codes: lockfile=/var/tmp/mylock if ( set -o noclobber; echo "$$" > "$lockfile") 2> /dev/null; then exit_normally ...
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2answers
785 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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2answers
182 views

Linux 'mail' command: Can't open display

I've just installed the 'mail' command in Ubuntu (mailutils package) in order to view feedback from cron jobs. I type 'mail' at the prompt and see something like this: "/var/mail/*$USER*": 1 message ...
2
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1answer
155 views

Rsync over Rsync via cronjob

I have a local server which Rsync's from some computers on the LAN. It's a part of a backup solution. This Rsync runs via cronjob twice a day. Occationally people add gigantic amounts of data, like a ...
3
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1answer
287 views

ls gives me different sort orders during a cron job

I have a cron job that, among other things, does a recursive ls of a directory into a file. This gets compared to another file that I've created that, supposedly, contains an identical listing of the ...
4
votes
1answer
1k views

start-stop-daemon makes cron pidfile with wrong pid

I have an init.d script to start crond which specifies the following for start(): start-stop-daemon -S --quiet --make-pidfile --pidfile /var/run/crond.pid --background --exec /usr/sbin/crond ...
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2answers
902 views

Running `screen` through a @reboot cron job

I want to have a script running in screen at startup. This doesn't work: @reboot pi screen -d -m /home/pi/db_update.py however running this manually as user pi works: screen -d -m ...
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2answers
50 views

When will this cron run

Cron: * */6 * * * /path/to/command I want this cron to run once in every 6 hour. Whats wrong with the above cron definition, and why?
3
votes
2answers
291 views

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
vote
1answer
116 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, ...
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2answers
91 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
333 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
244 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
11k 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
224 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 ...