Cron is a time-based job scheduler in Unix-like computer operating systems. Cron enables users to schedule jobs (commands or shell scripts) to run periodically at certain times or dates.

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Crond stopped sending e-mails for no apparent reason [duplicate]

I have a cron job that I want to run just once a day (executes a rake task), but while I'm testing it I have it set to run every 5 minutes. It was running perfectly fine this morning and sending me ...
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2answers
2k views

crontab listing or editing results in fopen: permission denied

Recently, a job configured to run from a user's crontab stopped executing. When attempting to list or edit the crontab for the user, the result is: user@host:~$ crontab -l crontabs/user/: fopen: ...
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1answer
125 views

Spam emails from Suse server: test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp

Have a virtual server with old Suse. About a month ago cron started spamming me with emails like this: Subject: test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp ...
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1answer
782 views

Problems with a PHP include from the command line (or cronjob) [closed]

I am trying to setup a cronjob on my AWS EC2 instance. There is nothing wrong with the actual entry in the crontab file but when I try to run the command in the command line I get this response. PHP ...
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1answer
218 views

Why does this command to send emails work from the shell but not as a cron job?

I have a problem with cron jobs, I need to send email notification to users, I use this command curl "http://example.com/index.php?option=com_community&task=cron">/dev/null 2>&1 When ...
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1answer
28 views

Starting a detached screen has no effect

I want to start a shell script in detached mode on ubuntu bootup (via cronjob @reboot) but it doesn't even work when I try it directly. Syntax: screen -d -m -S myscreenname /path/to/my/script.sh ...
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1answer
214 views

MySQL: Error establishing a database connection

I'm running a DigitalOcean.com Virtual Server with the typical Ubuntu LAMP Stack for a few WordPress sites. Of course, every week or two the MySQL service seems to crash. If I restart MySQL or the ...
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1answer
249 views

How to make sure script is always running?

I have 4 scripts in crontab that start on server boot. After 12 hours or so, some throw an exception and stop running. At that point, I want my server to just start the script again, so each script is ...
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1answer
498 views

ssmtp won't send cron email

I can't figure out why cron on my AWS EC2 (Ubuntu 14.04.1 LTS (GNU/Linux 3.13.0-32-generic x86_64)) can't seem to send email out via sSmtp to AWS SES. This works: echo "test" | ssmtp my@myemail.com ...
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1answer
75 views

Where does cron store the real-time stderr logs?

I've got a cron job configured to run a command like some-command 2>&1 >/dev/null | tee -a /tmp/some-command.STDERR.$(date +\%Y-\%m-\%d.\%H.\%M) I've also got a tmpreaper cron job that ...
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1answer
2k views

Python script succeeds manually but fails on crontab

So I'm currently trying to get a script working but it's behaving differently when I run it manually than when I run it from crontab. Basically, I have a reverse ssh tunnel set up from one server to ...
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1answer
400 views

run multiple instance of same php script from bash

I am running a cron job to execute a php file multiple times per minute like this * * * * * /usr/bin/php /var/www/html/myFile.php >> /var/www/html/cronlog 2> /dev/null * * * * * ...
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1answer
167 views

my crontab doesn't send mails anymore

Before saturday, mailing after crontab executions were working but from now on, it doesn't work at all, but the config didn't changed. Operating system : Debian 7.5 I tried using PHP the mail ...
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1answer
28 views

Is 6,10-12 valid syntax fo the hour part of a cron task? [duplicate]

I know that "10-12" is a valid range for the hour part of chron and that "6,7,8" is avlid syntax too. Can I combine these 2 an us "6,10-12" if valid hours time is at 6 and between 10 and 12?
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89 views

How to make permission of mysql log file stick?

I am running a custom cron script to do log rotation and email newly compressed log files. Due to permission problems, I have to set the group user to root instead of the default mysql so that the ...
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3answers
3k views

Can't run AWS CLI from CRON (credentials)

Trying to run a simple AWS CLI backup script. It loops through lines in an include file, backs those paths up to S3, and dumps output to a log file. When I run this command directly, it runs without ...
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1answer
61 views

How can I know which user has cron jobs configured on a machine with 200+ users?

I need to build a new machine and copy properties and some cron jobs from another machine which has about 200+ users and I don't know which users have cron jobs configured. Is there a way to extract ...
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1answer
214 views

Perl FTP script fails from crontab, works from cmd

We have a Perl script we've been using (launched from crontab) for several years to upload images using Net::FTP. Recently we began to notice problems where the images were not uploading and errors ...
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0answers
406 views

cron.weekly runs on wrong day of week on Ubuntu

I have this line in my /etc/crontab: 47 6 * * Sat root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly ) So the cron.weekly should be started every Saturday ...
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1answer
76 views

Binding timestamp value to a variable in crontab

I'm basically trying to declare a variable with a date() value in crontab as I will constantly be using the same date structure over and over, here is what my crontab looks like so far. php = ...
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1answer
765 views

sending email from cron in html format not text

i am trying to send email every 1 hour from cron job which is executing a php script that fetches data from database and shows in a table format. i have CentOs 6.1 where i created my cron job.firstly ...
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1answer
963 views

Is it better to use the systemd service unit's Restart & RestartSec, or use a systemd timer unit?

I have a couple of in-house automated scripts running at periodic intervals. One is every five minutes, the other is every minute. They don't really need to be ran on-the-dot; e.g. I don't care if ...
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2answers
3k views

When cron is completed How to get email notification and log in a file (both)

I am a Newbie to linux. I'm trying to figure out things. Can someone kindly help me how to combine these two commands? (1) Normally cron can results can be directed to a log file by editing crontab ...
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2answers
286 views

Backup Ubuntu server with cron/rsync: Problems with resuming large files

I currently have a dedicated Ubuntu backup server which wakes itself up from suspend (using rtcwake) daily. 5 minutes later a cron BASH job kicks in, using rsync to pull files from various network ...
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1answer
133 views

Periodically run an MS SQL query on multiple sites

I have been tasked with pushing Google Analytics data periodically to SQL Server 2005 running on a different server from various websites (about 450 of them) grouped on various servers. I understand I ...
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4answers
215 views

rsync changing already existing files

I have a simple line of rsync in my crontab that gets backup files from the prod server to another. It looks like it is touching the already existing files in the destination folder. This way, the ...
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2answers
742 views

Weird syslog order

Have you ever seen wrong order in /var/log/syslog ? I think that it causes only crontab. Jun 28 22:20:01 alex CRON[2327]: (root) CMD (something > /dev/null) Jun 28 22:21:01 alex CRON[2700]: (root) ...
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3answers
1k views

Server incremental backup to AWS Glacier

I'm looking to backup various directories and files from a Linux server to AWS Glacier. I'm trying to work out the details on how to do manage this. Incremental Backups I want to upload files ...
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2answers
124 views

rsync last 3 days plus weekly backups

I have a shell script that i'll be running with a crontab. Basically I want to modify this so I can do daily backups for the last 3 days. I've seen examples where the last 7 days are backup. I just ...
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1answer
49 views

Cron: possibility to specify a hours to start/stop on a specific day

What is the crontab syntax for specifying running hours/minutes based on the day of the week in a single entry? There's a task which needs to be executed every /1 minute from Monday,01:00 to ...
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1answer
157 views

Ubuntu 10.04 cronjob with curl dosen't work

I would like to execute some php script via cron job i have curl, crontab installed, but the cron job dosen't run/create any log file. crontab -l * * * * * curl ...
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3answers
796 views

munin-cron Unable to Copy Contents

I recently installed munin on my (Fedora12 based) server. Now, I wanted to get all the graphs in a static directory (The application runs on Django). So, I edited the file /etc/munin/munin.conf by ...
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1answer
113 views

can I use @reboot in cron.d files? [closed]

I want to run a job with cron on reboot as a particular user. I have been able to do this successfully using crontab to write to /var/spool/cron/crontabs/username with something like: @reboot ...
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1answer
1k views

ways to automatically fix line endings in shell scripts or files who break with ^M

Problem We regularly break our files lines endings and things stop working without us noticing. Bash complains about "invalid option" or ": command not found" as described here: ...
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1answer
281 views

Why does my cron job sometimes fail on wget: unable to resolve host address [closed]

My cron job runinng properly .But sometimes it get fail with following error message" failed: No address associated with hostname. wget: unable to resolve host address "
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1answer
754 views

How to get atop to create daily logfile

I'm running a website on a VPS running Centos 6.5 and am having some issues. I'm new to serveradmin so just learning. atop was already installed on our machine and it's working. I wanted to go in and ...
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1answer
203 views

Allow nginx www to run Centos at command

I have a job which created by PHP script running as www (nginx) 31 2014-06-09 19:08 a www After the time passed, the job is executed but nothing happens. But if i run it as a root, 32 ...
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2answers
366 views

Remove all files in directory except last 20

I have question why is my cmd for "removing all files in directory except last 20" not working within cron but in command prompt yes. * * * * * ls -1tr /home/testusr/test | head -n -20 | xargs -d ...
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1answer
58 views

how to increase the size of /var/log/cron on cent os 6.4

how to increase the size of /var/log/cron on cent os 6.4. I wanted to keep the logging history longer. Thanks!
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1answer
721 views

Shell script only executes partially when run with CRON [duplicate]

I've written a shell script that does the following: Retrieve mail from a POP3 account (using GetMail) Save a copy of that email to S3 (using AWS CLI) Email me the filesize of the email The ...
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1answer
53 views

run ubuntu crontab every 19th of the month in 2am [duplicate]

i'm not sure about something and that's why asking i want a process to run every 19th of the month in 2am i don't want the cron to run after that time or before and only when the date is 19th - in ...
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2answers
1k views

Capturing output from a remotely executed command via SSH fails in CRON

This question is in a direct relation to this one: ssh fails to execute remote command when run from cron bash script - works from CLI I'm not able to comment on the accepted answer as I don't have ...
1
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1answer
97 views

Difference between “crontab -e” & editing crontab file manually? [duplicate]

I noticed some people use "crontab -l" to view cronjobs and "crontab -e" to edit them. However there are also times where people manually modify "/etc/crontab" to view/add/remove cronjobs. Both ...
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1answer
161 views

Crontab - Unusual config - Skip a small weekly time window

I have a business requirement to run an unorthodox crontab schedule as follows: Everyday run a script from 1-21 Everyday but saturday, run from 21-0 So I was thinking this would work: 5 1-20 ...
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1answer
196 views

logwatch on Centos 6.4

My logwatch is configured correctly and is working correctly when I issue manually /usr/sbin/logwatch I added it to root's crontab and it is listed correctly when I make crontab -l which gives: 0 ...
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1answer
185 views

Programmatically adding two lines to crontab

I'm trying to add two lines to the root crontab when building an AWS instance. I have a set of commands that are part of the "user data". These commands are run as root when creating the instance. I ...
3
votes
2answers
287 views

hg pull from Bitbucket fails when run from cron

I have a local copy of a Bitbucket repo on one of my servers (under the user rob), and I created a script that runs every hour in cron and attempts to pull & update the local copy. The issue I'm ...
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1answer
239 views

execute script at particular time in amazon ec2 linux [closed]

I am newbi in amazon ec2 as well as linux, I am working on pentaho kettle, for starting my job process i m using following command in amazon ec2 instance, cd /dev/pdi/data-integration (reaching to ...
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0answers
116 views

Incrontab does not execute command

I have copied this question over here from unix.StackOverflow When I use incrontab out of the box, I mean no changes, I get no result, as if the cmd was not executed. my incron line is : /crrae ...
6
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3answers
664 views

Crontab job dependency to prevent race [closed]

I want to run a cron every 5 minutes, but I don't want the next cron to run if the previous did not finish yet. What can be done about this? Are there any tools to support this? Thanks