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

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55 views

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

There are two vps: one is digitalocean, the other is bangwagong host. All the operating systems on them are Debian7. I want to split cron logfile up from syslog with the following steps. step1: vim /...
2
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1answer
236 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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0answers
23 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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2answers
509 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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1answer
226 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
55 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
314 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
285 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 /home/...
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1answer
70 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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2answers
231 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
292 views

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
151 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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2answers
3k 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 comes about because the script in crontab doesn't work, ...
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1answer
763 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 * * * /home/...
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2answers
603 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
287 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 Cron[...
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1answer
302 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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1answer
841 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 ...
2
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1answer
437 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
111 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
444 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
114 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 /var/lib/...
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1answer
88 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
296 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
225 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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0answers
54 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
181 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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3answers
184 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 ...
2
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1answer
3k 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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5answers
3k 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
865 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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3answers
364 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 ~/Desktop/...
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1answer
998 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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1answer
148 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
127 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 ...
2
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1answer
488 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 ...
2
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1answer
422 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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1answer
113 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?
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2answers
850 views

How to set up cron job in Linux to delete all regular files?

I need to set up a job to delete all of the regular files in the /home/admin directory on the second day of every month at 8:30 A.M. It seems like wrong command: # crontab -e 30 08 02 * /bin/find /...
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2answers
351 views

CRON Job To Execute Command On Low Memory

I have a situation where I may need to execute an SAP command line tool hdbsql when memory gets too low (to help clean out the HANA table cache). I'm not well versed in Unix/Linux, and was wondering ...
2
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1answer
422 views

Task not run by crontab

crontab strangely does not execute my script, although the script is running just fine from the shell terminal. I already made sure that scripts are separated from each other by a new line space. ...
0
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1answer
394 views

Running a ruby cron job

I was trying to create a cron job which runs a ruby code on digital ocean, however it seems I'm making a mistake. It doesn't give any error but it doesn't also do anything. I ran this cronjob on my ...
0
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3answers
819 views

how to tell crontab to execute the command from now instantly

I have a command in "/etc/crontab" which runs a database program every 7 days. Now, I see that this command has been commented by another user for 2 weeks. I immediately uncommented the line, and ...
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votes
4answers
493 views

Only allow process to run between hours x and y

I use a mobile data connection service. I only have unrestricted bandwidth between 9am and 4pm. I wonder how I can "silence" applications such as the Dropbox applet outside that schedule. I thought ...
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2answers
4k views

Run A Cron Job Task Every 30 Seconds [duplicate]

It's possible to set the cron job tool in my website cpanel 'VPS Hosting' to execute php file every 30 second I am using it to execute php file once at a minute *,*,*,*,* but I need to set it to run ...
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1answer
86 views

Checking the schedule of a cronjob and doing a conditional check on specific parts

Edit: I managed to solve this myself, I actually deleted my original question as I was over complicating the process slightly, but have since answered it in case others find it useful. RegExp is not ...
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1answer
218 views

help with remote file find/scp

I have a set of files on a remote sftp which I need to download to a server every day. sftp uses ssh keys to authenticate, so I created a ssh key and added to the remote server authorized folder. I'm ...
0
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1answer
292 views

Cron Job every 55 minutes [duplicate]

I want cron to be run in every 55 mins. I followed the link CronJob every 25 minutes and my crontab command is */5 * * * * [ $(( $(date +%s) / 60 % 55 )) -eq 0 ] && wget http://localhost/...
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1answer
435 views

Issue Using Crontab to Create/Restart Screen and Run Command

I want to have a certain script (rails rake task) running on my server at all times - it basically populates my DB using a live feed. I can create a screen (http://linux.die.net/man/1/screen) and run ...
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4answers
2k views

How to stop minute cron job?

I have a program written in python; my program scrapes a value from some financial website every minute and pushes that value into my DB. My program takes like 1 or maximum 1.5 seconds to do this job....