Cron is used to execute scheduled commands. It acts as a task scheduler on Linux and UNIX systems which will execute commands at specified times set by the user. Cron has a great deal of customization and is often used on server environments where common tasks are run on a regular basis.

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Backup database with mysqldump

Hello i use mysqldump with crontab for save my database each hour but after one day i have 24 files What is solution for auto delete if more 5 files ? And what is chmod for folder backup for security ...
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125 views

Shellscript creating directories in wrong direcroy when running from crontab

I have written the following code which will create directories with name format "nowt_hour_minute_second". In that directory another text file will be created with the directory creation time. Now I ...
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1answer
161 views

Launch url to start a script like a cronjob?

I have a website on mutualised hosting (server A). I need to run every minutes a script, I just need to go to http//www.mysiteserverA.com/run.php I searsch a solution automaticly run this script every ...
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17 views

rsync never terminates and makes Tb size snapshot directories

I have a cron job that runs rsync every day to download data from a server. It was working fine until the space allocated for me in the server was changed (probably increased). It happened as I was a ...
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1answer
467 views

What schedules logrotate?

I'm working on the program which creates a big log file. I want to handle it with logrotate. This is a configuration I put to /etc/logrotate.d/: /var/log/myproject.log { hourly maxsize 1 rotate ...
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3answers
1k views

Root crontab not running

For some reason, my root cron tab does not seem to be running. Trying to reboot device every night at midnight. Should be the following as root: crontab -e Then add: 0 0 * * * /sbin/shutdown -r ...
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48 views

Run cron job to execute a script when a particular file is updated

I would like to automate a process which requires running a script to generate some files. To do this I thought that adding a cron job to run this script would be great. But I want cron to run the ...
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1answer
29 views

Custom cron job filename for a package

I'm willing to create a cron job for a package but when I define it in debian/cron.d it gets installed as /etc/cron.d/package. I'd prefer to be able to change the name of the cron job to be something ...
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40 views

Many CRONs processes

My system from couple days have some strange issues. Main thing is that I can't ssh for most of my day. I noticed that is connected with amount of CRON porcesses. In crontab I have about 90 records ...
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1answer
132 views

This anacron cron job is sending emails to me - how can I redirect the output to null? [duplicate]

$ cat update-notifier-common #!/bin/sh set -e [ -x /usr/lib/update-notifier/package-data-downloader ] || exit 0 # Try to rerun any package data downloads that failed at package install time. ...
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1answer
60 views

How to implement in upstart that a service is preventive restarted every x hours?

I have a component --- started with upstart --- with a bug. The bug causes the application to freeze and unfortunately, it does not crush. As a temporary walk-around, I want to force the service to ...
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88 views

pmcmd not working with Ubuntu crontab or gnome-schedule

I have scheduled a shellscript which interns calls an informatica workflow with PMCMD command. when the script executed manually, it is starting the workflow properly but when the workflow is ...
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1answer
60 views

run a script and return system to suspended or running mode

Somehow I cannot find how to do this common task. I want to run a (backup) script daily at certain time regardless whether the system is running or suspended and return to the previous state ...
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1answer
37 views

Why am I getting this annoying log messages.CRON[17405]: (root) CMD every minute

I have configured rsyslog.conf file to store log messages to mysql but I am getting some annoying log message in my MySql table. which looks like this. Nov 3 14:48:01 username CRON[17405]: (root) ...
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2answers
104 views

Crontab unable to open google chrome

I have written a chrome extension that performs a task whenever it is available, and for that I would need the chrome browser open at all times. My idea was to have a check say every minute if the ...
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0answers
116 views

Scheduled Cron Back up from EC2 to S3

I have created a script for scheduling sql back ups and store in Amazon S3. Below is the script that I used for taking backups. DATABASES="testdb" testdb_USER=root testdb_PW=root ...
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1answer
42 views

CronJob not working as expected

I generated a cronjob line for crontab -e with Crontab Generator: * */2 * * * curl http://www.example.com/cron.php >/dev/null 2>&1 I was expecting that it should run every 2 hours. But in ...
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1answer
56 views

Cron process sends email, where are these sent emails?

Ubuntu 14.04 I have an email process that sends an email via cron, using sendemail (which I believe is a Perl program that doesn't need an MTA). Where are these sent-emails stored? If they are stored ...
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88 views

crontab and running nmcli in a script

I am trying to come up with some way of making a persistent VPN connection, so if it drops (as it does from time to time) the connection will be remade. I though using crontab would be the best way to ...
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1answer
93 views

Launch a .desktop file from boot

I have a .desktop file on my desktop that launches a html page. I need the .desktop file to run from startup, what would be the best way to do this? I have tried crontab and also the startup ...
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1answer
63 views

Cron emails no longer going to local 'chuck' account

Ubuntu 14.04 installed as a VM on a machine that sends emails, with attachments, via Perl 5.18.2. That part works because Perl talks directly to the SMTP server. Let's call the machine name ...
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27 views

Reading Cronjob Output [duplicate]

I have a task setup to run on my cronjob where I need to read the output. What I need from the output is the starting character (let's say A) and the ending character (let's say Z). A helps me ...
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2answers
219 views

Performance loss after 30 minutes

This one's baffled me. I have Ubuntu 14.04, 3 days ago (2014-20-10) it started slowing down. I've reproduced it by opening gedit and then closing gedit, when the issue is active it hits roughly 2 ...
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2answers
2k views

Cannot run bash script from crontab when it works from command line bash

I have a strange problem of being to able to run a bash script from commandline but not from the crontab entry for root. I am running Ubuntu 12.04. * * * * 1-5 root ...
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1answer
127 views

shutdown 5:30pm every day

for a five thirty pm shutdown, should I change this: 30 02 * * * /sbin/shutdown -h now to: 30 17 * * * /sbin/shutdown -h now see also: Crontab Shut down command didn't work
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46 views

Auto Update Even When Laptop Lid Is Closed

I am trying to follow this guide for auto updating Ubuntu. I am using the Advanced Aptitude option. My problem is that I am trying to do it on a laptop and cron doesn't work when the lid is shut. I ...
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2answers
120 views

How to create a cron job to monitor the status of a port ?

I am trying to create a cron job that would allow me to monitor the status of a particular port and send out notification via email while it changes from listening state to anything else.
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2answers
2k views

How to make crontab email me with output?

How can I make crontab email me with the output of its jobs? I have MAILTO=redacted@yahoo.com.au above the jobs, but it doesn't work. I know I need to use something like Postfix or Sendmail but for ...
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3answers
282 views

Run rkhunter regularely on a desktop system

I want to get a warning on my desktop when rkhunter finds something odd on my system. I whitelisted some files and dirs that seem ok in /etc/rkhunter.conf so I get no warnings anymore. Now I want to ...
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1answer
166 views

git push script, only if difference

I've found some nice questions illustrating how one would write a script automating git push/pull with cron here and here, but I want to elaborate on that slightly. I only want to push/pull if there ...
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0answers
31 views

truecrypt in bash script called with crontab

I have a bash script that uses truecrypt to mount a volumn. The command is the following: RESULT=$(truecrypt $FILE 2>&1); When I execute the script with bash script.sh I receive the ...
2
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2answers
223 views

Cron Job Creation

Okay, so I have had a quick look at the answers posted on this question and re-formulated my cron job. So, let me break this down as clear as I am able to: PC/OS | Shell Info I am currently running ...
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1answer
157 views

Question about CRON trim weekly

I have got samsung SSD and so TRIM is on automatically. However I am bit confusing about how TRIM cron weekly starts. According to cat /etc/crontab it says that CRON weekly will start at 6:47am (odd ...
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1answer
136 views

How do I change my cron loglevel to 7 from default value 1?

> man cron, tells me that the default log level for cron is 1; i.e. cron "will log the start of all cron jobs." I want to set that to 7, so I checked in all the wrong places, starting with the file ...
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1answer
147 views

Cron job daily not running

I'm having trouble with setting a cron job to run daily when I enter the script to /etc/cron.daily when I put it there it doesn't run at all like it should be doing. I setup a script so that it can ...
2
votes
1answer
101 views

Running Chrome extension periodically using a cronjob

I have built a chrome extension that performs a set of actions on a random webpage. The extension seems to work fine and I plan to run it on a VPS running Ubuntu with a XFCE desktop environment. Now ...
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0answers
68 views

Configure cron to include FQDN in email

We have machines named like so: serverA.subdomainA.TLD.co serverA.subdomainB.TLD.co Works fine for us, except when I get an email from cron, the messages looks like: From: root@tld.com ...
3
votes
1answer
132 views

How can I start a shutdown with cron,only if no download is in progress?

I would like to shutdown my computer half-past twelve every day and can do that with "echo "30 0 * * * /sbin/shutdown -h now" > myrootcron.sh",but what if I want to cancel that shutdown or leave it ...
3
votes
1answer
184 views

Cron jobs are disabled on clean installation of 14.04

I have a clean installation of Ubuntu 14.04 and in my /etc/cron.daily/ I see *.disabled files: -rwxr-xr-x 1 root root 15481 Apr 10 09:04 apt.disabled -rwxr-xr-x 1 root root 314 Feb 17 2014 ...
3
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2answers
763 views

Ubuntu 14.04 and playing songs from cron

I recently upgraded my computer to Ubuntu 14.04. After the upgrade the system no longer plays the few songs I had it play via crontab. The crontab lines look like so: 0 9 * * 1-5 ...
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1answer
113 views

Problems with MAILTO setting: server doesn't sent cron's e-mail

I have Ubuntu 14.04 with Postfix mail server. Php/apache can send e-mails. But i don't resive any messadge from cron. Here my setup: MAILTO=crantisz@gmail.com */2 * * * * wget -o /home/user/out.html ...
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1answer
197 views

Change system volume using crontab & pactl

I am trying to change Ubuntu 14.04 system volume using crontab. I am using following command: pactl set-sink-volume 1 75% Which works fine when I use it in terminal or when I run script which ...
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1answer
1k views

What is the default timeout value for curl when used as command on terminal?

have searched a lot to find out default timeout value of curl. All suggests how to set timeout limit for curl. But Can anybody please suggest what is the default value of curl command timeout time? If ...
0
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1answer
42 views

running a tar command eats all resources

I am running a Rails application on my ubuntu 12.04 server. I have set up a cron job to take backup of all files uploaded to my application every morning at 2 am. It is a lot of files (around 900 mb). ...
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1answer
406 views

Alternatives to Cron

I'm doing a server running Ubuntu Server 12.04 and Apache. The users have continuous updates in the dinamic pages through a Java script, downloading JSON files through Ajax request to server. All the ...
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1answer
921 views

Crontab not executing jobs Ubuntu 14.04

I am trying to run bash script as a cron job every 15 minutes. The bash script simple calls a Java program. I made an entry in crontab to run the file every 15 minutes and saved it but it would not ...
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3answers
242 views

Not able to run sed on bash script

I am working trough some legacy code which does not work, I came across a part that is causing problems. I was hoping some one could help me out and fill me in on what is the exact functionality of ...
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2answers
173 views

Schedule a large download to resume everyday in a specific time-span of the day?

I want to schedule a large download to occur at night, between 12AM and 5AM. Everyday at 12AM wget should automatically pick up where it left the night before, and at 5AM, it should automatically ...
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2answers
404 views

can't reattach to screen

I've been having problems with screen (the terminal command). If I type screen -ls it gives me: No Sockets found in /var/run/screen/S-root. For screen -r I get: There is no screen to be ...
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0answers
49 views

Reg: Cron job is not running

I have set my cron jobs in linux ubuntu. Cron is not running and even already set my mail id to test whether cron is working or not.Its not luck for me. How to fix this issue.