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

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What's the most efficient way to log crontab shell script errors with error occurred time?

A common way to log crontab task errors looks like below: 1 */8 * * * sh /pseudo_path/test.sh 2>> my_err_log It's a concise command, but it can't record the error occurred time, and the path ...
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17 views

(SOLVED) how to close epiphany through a script with cron?

I have been making scripts to open and close a speficic website, with a cronjob, on the raspberry Pi. The opening script works perfectly. It is as follows: #!/bin/bash export DISPLAY=:0 && ...
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398 views

Mysterious “unable to resolve host” in dead.letter

In the ~ directory of the root user on my debian wheezy server regularly appears file named dead.letter with (currently) the following content: orion : Jul 25 10:17:31 : root : unable to resolve host ...
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28 views

Not all shell scripts working with crontab

I know this is a pretty broad title but I didn't know what to start with. Anyway, straight to the point. I have a little VPS I run apache and a Minecraft server on. I don't ever turn it off, but ...
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1answer
42 views

Hourly cronjob does not work

So just to sketch the outlines of this problem, i made an cronjob that should be executed on each full hour like this: 0:00, 1:00, 2:00. In all the manuals/tutorials i found on the internet they say ...
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92 views

Dynamic change of Linux root password everyday

I want to change my root password everyday based on the date. The password will be like a combination of a string and the date. The below code is working fine. echo -e "pass"$(date ...
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1answer
23 views

CentOS 6 Cron Logging Without Postfix

On a CentOS environment I am setting up, I have no need for email of any kind. I would like to simply disable postfix entirely, however this also disables logging from cron which I do need to have. ...
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54 views

Transfering mp3 files from a remote server via cronjob to the RPi without overwriting

I succeded in transfering all files from a folder via ftp from a remote server to a raspberry, but I would like to transfer only new ones. Below is the working script i have. #!/bin/bash -vx ftp -in ...
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70 views

Shebang does not set SHELL in cron

I have a script containing: #!/bin/bash printenv When I run it from the command line: env testscript.sh bash testscript.sh sh testscript.sh every time, it outputs SHELL=/bin/bash. However, when ...
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60 views

My cron job is not sending an email with any output, I see only a blank email

Can someone please help me here. My cron job is not sending an email with output. While I run the shell script manually it generates an email with output. Here is the script looks like #!/bin/bash ...
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39 views

cronjob timing - for every 3 months

I chanced upon this example: 0 9 1-7 * 1 * First Monday of each month, at 9a.m. I am not sure the 1-7 portion which is supposingly to be the dates of each month. Why is it a ...
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26 views

NTP issues on Nagios server

Our Nagios server NTP has isn't working right. First here is the issues: root@ccsd-lx-noc03 /var/log> tail -n 10000 messages | grep "NTP" Jul 5 16:19:36 ccsd-lx-noc03 nagios: SERVICE ALERT: ...
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22 views

Why can't split cron logfile up from syslog in bangwagong host?

There are two vps ,one is digitalocean ,oter is bangwagong host. All the os on them are debian7. I want to split cron logfile up from syslog with the following same steps. step1: vim ...
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1answer
22 views

XRandR script runs correctly from command line, fails as cron job

I'm running LXDE on Fedora 21. My script's purpose is to extend the display across two monitors: #!/bin/sh xrandr --output VIRTUAL1 --off --output LVDS1 --mode 1440x900 --pos 1280x124 --rotate normal ...
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22 views

Crontab, adding multicommands using && throws bad minute error [duplicate]

This works as a single command, crontab -l | { cat; echo '*/2 * * * * rm /tmp/*.tar'; } | crontab - One more job also works as a single command, crontab -l | { cat; echo '*/2 * * * * echo ...
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78 views

How do I scp a file from server A to server B from cron?

I have a file in server A which I am able to do transfer to server B using scp. I need to do this through a cron entry. server B has a password. How do I perform this?
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59 views

Should the key for an automatically running cron job that runs over ssh not have a passphrase?

I'm reading an article in Master Linux Now 2013 called OpenSSH: Easy Logins and it uses ssh-agent to allow you to enter a passphrase for your key once, and then you're able to connect to a remote ...
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1answer
42 views

Floating time cron job

I have a Linux host which I would like to have a cron job run on. I do not shut down this machine. I always suspend it. I want to run a job once a day and I cannot set it for a particular time since ...
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1answer
47 views

Using cron to start a process on a terminal without using screen?

I want to start a process in a terminal using cron. I want the process to start in a terminal, so that I can continuously see the output of the process on the terminal, and kill it / restart it etc. I ...
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1answer
44 views

Starting Debian mono application (that has a GUI) AFTER boot is done [duplicate]

I've been trying to figure out how to start an application after Debian (Wheezy) is done booting up and on an LXDE desktop session. It is a mono C# application. The script I have is simply mono ...
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1answer
31 views

Want to use find with rsync in script

I'm trying to make a script that will run in cron, that will search a path for specific file name. In the path there might be more folders with that same file name. If found and they are newer than 2 ...
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47 views

Start daemon process from cron job

I have been trying for a few hours to do the following (on Centos 6): cron starts process A process A checks if process B is alive if process B is not alive, process A starts process B The ...
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2answers
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shell script not running using crontab

This is my script mboxutil -l > n.txt sed 's/^.*user//' n.txt > n1.txt cat n1.txt | sed 's/^.//' > n2.txt sed 's/\/.*//' n2.txt > dss_list.txt rm -f n.txt rm -f n1.txt rm -f n2.txt sed ...
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1answer
45 views

Using nano to edit a crontab [closed]

I haven't been able to get crontab to execute any of my scripts on start-up. I want to know why it doesn't work. Below is an example of me trying to use it, and I've tried to provide as much ...
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55 views

Crontab Error: No Crontab For [user]

I'm seeing an error every time I do the command below. Why? $crontab -l no crontab for server Where server is the user account. This issue come about because the script in crontab doesn't work, so ...
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1answer
31 views

Is there a way to comment more than one entry at a time in cron?

I know the standard way to disable a task in cron is to comment the line with the task using the # sign in front of it, as with most Unix config files or shell scripts. e.g.: 53 23 * * * ...
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48 views

Where is my logfile of crontab?

no /var/log/cron ,no /var/log/cron.log on my debian7 ,Where is my logfile of crontab ? ls /var/log/cron* ls: cannot access /var/log/cron*: No such file or directory
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1answer
33 views

Unable to run the script in cron via manifest

I am trying to deploy a script to agents and run the script using cron every hour. When I am running puppet agent -t I am getting error: Error 400 on SERVER: Invalid parameter path on ...
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1answer
25 views

Cron Job to Keep Daemon Running?

let us suppose I have a cron job like this: */15 * * * * /path/to/thedaemon The daemon (it being a python daemon via from daemon import runner) will not allow multiple instances of itself, which in ...
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68 views

Why doesn't cron run a test script from /etc/cron.hourly?

This is the first time I'm using cron through its /etc/cron.hourly directory to run a script once every hour. For some reason, the script doesn't seem to run. Here's what I did: Added a basic test ...
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1answer
54 views

script running in crontab not giving output on shell screen

I am trying to run a simple echo script via crontab. I set that to run every minute, but it doesn't give output on shell screen. However, it runs fine when I run the script independently. Script ...
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3answers
37 views

Getting crontab events that would happen given a start date/time

Let's suppose we have a crontab scheduling some commands on an RPi project, and these commands toggle a status of a flag. The box could go out of power, and then reboot. I want to have the flag status ...
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2answers
91 views

CasperJS and PHP In Cron Job Cannot Open Files, Works Fine When Run Manualy

I recently got a new DigitalOcean LEMP environment with Ubuntu. I tried making an SH script that uses CasperJS to scrape data from an external website to a JSON file, and a PHP script to parse the ...
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2answers
34 views

Put two Cron jobs into crontab using wget

I am trying to put these two Cron Jobs: 0 3 * * * ! sudo -u asterisk /var/lib/asterisk/bin/module_admin --repos extended,standard,unsupported upgradeall 30 3 * * * ! sudo -u asterisk ...
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1answer
23 views

How is this crontab interpreted “*/N * * * *” where N is between 31 and 59?

If I need to run jobs exactly every 50 minutes, example. 00:50 run 1 01:40 run 2 02:30 run 3 03:20 run 4 04:10 run 5 05:00 run 6 06:50 run 7 Will */50 * * * * cron work as expected?
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1answer
41 views

Difference between CRON tab 0/5 and */5?

The title says it all is there any difference between creating a CRON tab using 0/5 and */5? For example: 0/5 * * * * vs */5 * * * *
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1answer
28 views

Cron not working at startup, but works if restarted?

For some testing, I need to reboot my system every minute. I have a busybox based system, installed cron using opkg. I setup a cron job using crontab, everything looks ok: root@SL1000-1103DC:~# ...
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28 views

Send email on every change of service status

I am running a Debian server and i have setup mailutils to send an email from command line from root@localhost to an external email. I would like to slightly modify it, so it can send emails on every ...
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1answer
32 views

Loading crontab from file at startup

I'm starting machines from an AMI (Amazon Machine Image) on AWS (Amazon Web Services) and want to load the crontab dynamically from a file instead of using the AMI's crontab. One approach I thought ...
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2answers
55 views

about executing a python program in a shell script which is scheduled on crontab

i have a problem with regards on crontab. I have a script named checker.sh and i want to schedule it that would run every minute: * * * * * sh /home/pi/checker.sh so i have the script here: the ...
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1answer
90 views

How to activate Virtualenv when a Python script starts?

I want to schedule a python script to run using cron on certain dates, the problem is that in order for example.py to work, example-env has to be activated, is there a way to make example.py activate ...
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1answer
173 views

nginx logrotate error on cron job

I'm running Ubuntu 14.04 LTS and nginx on a Digital Ocean VPS and occasionally receive these emails about a failed cron job: Subject Cron test -x /usr/sbin/anacron || ( cd / && run-parts ...
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1answer
119 views

Regex for crontab validation

I need to check in bash whether an entry into the crontab file is valid. Is there a crontab command switch? I can extract individual lines and try to control individual items through regex. But I ...
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52 views

Cron job not saving

I'm trying to write a very basic cron job but it doesn't seem to be saving. Here's what I've done: 1) crontab -e This opens up a file with vim. 2) #!usr/bin/env python 0 23 * * 0 ...
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59 views

tput: No value for $TERM and no -T specified

I am trying to run a bash script I have via cron, and I am getting the following error at the beginning of the execution: tput: No value for $TERM and no -T specified Here is what is in my crontab: ...
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36 views

Adding a crontab - syntax

crontab -l | { cat; echo "0 0 * * * /path/to/cron/job"; } | crontab - I took this line from the net, to add a new cron job. It works well and good. I got the doubts, 1) Why do we need the curly ...
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1answer
25 views

How to redirect tarsnapper output to /dev/null?

I use tarsnapper's make command for managing tarsnap backups like this: tarsnapper -c /usr/local/etc/tarsnapper.conf make Which works like it should and I get an output like this Creating backup ...
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1answer
41 views

How to schedule shutdown every day?

We have a server that is used for Linux thin clients in a class. The server is started when required and I want to schedule it to power off at 22:00 every day to avoid power wasting. I thought of ...
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1answer
77 views

Creating a cron job and watching its output in real time

When I look at the questions and answers on this forum, it seems like the threshold to ask a question is very high. At least for someone like me, with very little knowledge of Linux. Most of the ...
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56 views

what is the difference between cron and systemd ?

what is the difference between cron and systemd ? Why we can't use use only one of this two?