Questions tagged [cron]

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

Filter by
Sorted by
Tagged with
1
vote
1answer
558 views

PHP phantom cron job

I disabled all my cron jobs by putting a # in front of them. Except for one: @reboot echo "Hi I rebooted" The rest are: #0 2,14 * * * /home/backup1/mysql-backup.sh #0 * * * * mono /root/apps/...
1
vote
1answer
1k views

cron to delete after executing

I have a cron job which unzips a file and executes it. The cron is set to unzip, execute and delete the .zip file after. It's executing fine but it's not deleting the file. Here's the cron: /usr/bin/...
5
votes
2answers
4k views

Can a crontab job run concurrently with itself?

If I have a crontab job that runs, for instance, every hour, but that job may take more than an hour to complete, will the next job fail to run?
4
votes
1answer
627 views

How can i dump /tmp/files in CentOS to Dropbox using crontab?

How can i dump files from my CentOS box to Dropbox account? As regular nightly backup task.
10
votes
2answers
3k views

Interactive shell with environment identical to cron

I am aware of a lot of pitfalls in the magic world of crontabs, but sometimes it would help troubleshooting a lot when you have some smart way to enter an interactive (bash) shell with exact identical ...
4
votes
2answers
5k views

Configuring cron.hourly

I am unable to configure a cron job to run by placing it in /etc/cron.hourly folder. SHELL=/bin/bash PATH=/sbin:/bin:/usr/sbin:/usr/bin MAILTO=root HOME=/ # run-parts 01 * * * * root run-parts /etc/...
6
votes
2answers
7k views

How do I check active crons?

I'm trying to hunt down a cron job (or the equivalent) which I know is running, but I can't find it in the default cron files for my system (FreeBSD / Linux / BSD). How can I tell which ones are ...
3
votes
0answers
1k views

Cron file syntax checker/validator script

Does anyone know a script (bash, perl, php ...) to validate the syntax of crontab files? I found this http://www.intuitive.com/wicked/showscript.cgi?053-verifycron.sh but just Vixie cron notation is ...
1
vote
2answers
2k views

CentOS, PHP file is running from browser, not from cron daemon

I am working on CentOS. I have created a PHP file which run from browser http://mydomain.com/backupfile/dobackup.php I have added the script from crontab and made the file executable, but it is not ...
2
votes
1answer
3k views

/etc/crontab edited via copy and paste, how to revert back?

I have made a mistake, I have edited /etc/crontab via copy and paste. And now those crontab entries are not working. [root@process ~]# cat /etc/crontab SHELL=/bin/bash PATH=/sbin:/bin:/usr/sbin:/usr/...
2
votes
1answer
1k views

How to use crontab (Gentoo)?

First I installed and ran crontab: emerge cron crontab -e In another console, I ran man cron, but this has no examples of how to use crontab. Where can I get examples, and why are there none in the ...
2
votes
2answers
1k views

crontab and DST disagreement with different timezone

From a server hosted in Poland (UTC +01:00), is there a way I can consistently have a crontab entry run at 9am New York time (UTC -05:00)? For me this wasn't trivial since the daylight saving time ...
3
votes
1answer
7k views

Periodically download attachments from mail box

Is there a preferably CLI based program I can use to regularly (through cron for example) use to check a mailbox, and download the attachments into a folder? I have a mailbox called photos@doamin.com,...
6
votes
1answer
1k views

Run script when specific users logout

I need to run my application in screen when specific users are logged out and kill the screen when someone from my user list logged in. So I am thinking about bash script, which will be called ...
1
vote
1answer
2k views

Cron job - permission denied creating a file

I have a cron job: #!/bin/bash fn=db.backup.$(date +%m-%d-%y).sql mysqldump -uMyUsr -pMyPass --add-drop-table dbName> $fn find ./ -name '*.Z' -type f -mtime +7 -exec rm -f {} \; I get an error: ...
0
votes
2answers
603 views

Why does this fail as crontab but works as script [duplicate]

Possible Duplicate: What’s wrong with these two cron job’s? I want to print a formatted output from a file containing lines of date, time, long number, and long number. I set LC_NUMERIC to UTF ...
3
votes
2answers
4k views

Add a one-off scheduled task through a shell script?

I'd like to execute a task at a given time, once. I know I can just use crontab -e to add it there, but I'd like to do that through a shellscript. crontab -e gives me some temporary file to edit ...
1
vote
1answer
689 views

Putty doesn't seem to start from python'd crontab

I have the following Python script, chmod +x'd. When I run this script from the command line and Putty has not been started, it launches putty: #!/usr/bin/env python from __future__ import ...
4
votes
1answer
784 views

Emptying a directory owned by another user weekly

I have a temp directory set up where users can place whatever files they need to send to other users via HTTP. The owner of this directory is an SFTP user, and cannot run cron jobs. I have one shell ...
2
votes
3answers
296 views

Crontab syntax: using '*' for minutes value

What happens if I use '*' for the minutes value? Is the command going to be run every minute? For example: * 4 * * 0 <command>
0
votes
1answer
1k views

cron logging but not working on some commands [duplicate]

Possible Duplicate: How can I execute date inside of a cron tab job? I have a server in Amazon EC2 that I run a backup script on with cron. However, it is not working. To test out if cron is ...
6
votes
3answers
11k views

How can I ensure my cronjob will run at specified time?

I'd like to know how I can check to see if my cronjob will run at the specified time I set it at. Is there anyway I can test this without having to wait for that time? Here are my crontab -l results: ...
1
vote
3answers
4k views

Why isn't cron running automatically?

OS : Ubuntu 12.04 Now I want to use Backup and Whenever gem to automatic backup my database. When I connect the server by ssh as an added user to run backup perform -t my_backup,it works well.But the ...
3
votes
2answers
3k views

Python script to shutdown system doesn't work in cron

A python script to shutdown system works fine from the terminal but doesn't work when included in crontab. The script is called by cron but ends with an error 'shutdown command not found'or 'init 0 ...
8
votes
3answers
21k views

Can I use logrotate to compress daily (date named) logs?

I have logs in the following format: YYYYMMDD I want to compress old logs (older then current day) and maybe move them to a different directory afterwards. Can I do this in logrotate, or do I have ...
0
votes
1answer
895 views

Mplayer cronjob doesn't work [duplicate]

Possible Duplicate: How can I execute date inside of a cron tab job? I made a cronjob to record a stream every friday between 23pm and midnight. Only somehow this doesn't seem to work. the ...
4
votes
1answer
256 views

In crontab is it possible to specify a user from a variable?

I am trying to have the following cron executed with a certain user. U=`/usr/bin/w | grep -w :0 | awk '{ print $1 }'` */1 * * * * $U /opt/script.sh It seems the deamon doesn't know how to interpret ...
5
votes
1answer
6k views

Maximum Number of Entries in Crontab

If it exists, what is the maximum number of cron jobs (entries?) that can be added to a server's crontab? How do I tell? I'm on RHEL 6. I googled around, but did not see a conclusive answer -- some ...
4
votes
2answers
725 views

crontab, instance, memory issues+spamming

I have a cronjob that runs php5 wp-cron.php every minute to update my website. However something happened and i had 30+ instance of it (31 is marked on this one dump of ps aux). It ate up my ram, ...
1
vote
1answer
603 views

How to create a cron which finds/kills/clears old puppet runs?

I am a new user of bash/cron, and I was given a task to create a cron which finds/kill/ and clears old puppet runs that were not successfully installed. The more help the better, but I am more or less ...
5
votes
2answers
16k views

Cronjob to run every 30 minutes

I want to set a cronjob entry that runs a script every 30 minutes from 9:00 to 18:00 but I do not want it to run at 18:30. The script should run for the first time at 9:00 and for the last time at 18:...
3
votes
1answer
3k views

Why does sftp hide the log from stdout?

I have a script a.sh, which has an sftp command: echo "Starting to sftp..." sftp xxx@xxx.xxx.xxx.xx << END_SCRIPT ls mput *.csv.gz bye END_SCRIPT echo "Sftp successfully." If I run it ...
0
votes
3answers
3k views

I want to set up a basic cron job that sends an email

I am running OS X 10.7 and I am learning unix commands. I would like to set up a very basic cron job that sends me an email with a certain message. How would I go about this. From what I have read, I ...
3
votes
2answers
3k views

Bash script doesn't work as cronjob

I'm trying to get this simple bash script to work within a cronjob. It's used to generate static nginx webserver statistic pages using GoAccess. I tried everything I know to resolve this issue, it ...
1
vote
1answer
207 views

crontab sets up user variable, redirect output, and detect connetcted network

I have three problem, all of them are about crontab. Can I access $HOME variable in crontab ? for example, use $HOME like this: PATH=$HOME/bin:$HOME/scripts:$PATH ? or * * * * * echo "test" > $...
1
vote
1answer
1k views

Crontab with SVN and Git

I have some repos which are both in SVN and Git. My username is guyfawkes, and in my home directory I have folder www which contains all my repos. In this directory I also have file update.sh: [...
2
votes
2answers
1k views

How do I run a program only once per day, while accounting for variable uptime and possible failure of program?

I need to run a command once, but only once, per day, until it succeeds. Continuous uptime cannot be expected, and program success cannot be guaranteed. This program requires network access, but not ...
4
votes
3answers
2k views

In linux, would it be possible to run a script every day 3 minutes later than the previous day?

My first solution to this was to execute date +%Y%m%d%H%M and put that format of numbers into a file, and run the script every minute from cron. Then if the date from the file matches the date command,...
3
votes
1answer
5k views

Custom directory for cron commands

I'm using vixie cron on Debian/Ubuntu. How to set a custom directory to be read by cron? I want to lead crontab to run commands found in a series of files, e.g. /home/cron/*.cron or perfectly /home/...
5
votes
2answers
11k views

/etc/crontab permissions

The /etc/crontab file has the permissions: -rw-r--r-- I understand that this file is for system cron jobs and other users should not have permission to modify it. The current permissions allows all ...
4
votes
3answers
3k views

What's the purpose of having different crontabs per user?

Is it just for controlling the permissions of the script being called or does it also effect when or if the script runs? I assume if I setup a cron for a non-root user it should always run, even if I ...
4
votes
1answer
734 views

ipsec auto --status fails in cronjob

I have a server monitoring script which, among other things, checks the state of an IPSec tunnel using ipsec auto --status It works like a charm when run from the console (as root) but as soon as I ...
5
votes
1answer
547 views

How to print the next crontab tasks to be executed?

Is there some way to display a list of the approaching task executions? That is, translate this crontab: # m h dom mon dow command * * * * * imapfilter 4 20 * * Sun fgit gc -- ~/...
-1
votes
2answers
669 views

Centos Crontab not responding

I was learning and experimenting with crontab today. The default editor was just too difficult for me to figure out which caused me to remove my crontab by running crontab -r. Now, when I run ...
0
votes
2answers
160 views

Testing Scripts

If I have a script called teiid.sh set to run daily by a cron job. The scripts purpose is to initialize the startup of teiid. How would I make a call to test to see the if teiid.sh is working ...
1
vote
2answers
586 views

need portable crontab host-checking/failover logic across Linux & Cygwin

A host-ping test that always works correctly from the interactive bash command line in Cygwin, is behaving incorrectly in its own crontab--always selecting the second host--and I can't figure out why: ...
2
votes
2answers
990 views

Is there anything in unix crontab to determine this should be executed in PST/CST standard time?

There is this thing in QuartzScheduler where we can say execute this in CST/BST/ or whatever timezone. This is also good when you want to execute some jobs in certain timezones and certain jobs in ...
1
vote
1answer
85 views

Setting up a cronjob as a file

I want to create a cronjob at my Ubuntu server by adding/modifying a file in the /etc/cron.d folder, rather than using crontab -e as it's not too easy to automate. I've managed to make a file looking ...
12
votes
1answer
1k views

What does the following kernel message mean?

The following appears /var/log/messages, what that means ? Feb 19 22:51:20 kernel: [ 187.819487] non-matching-uid symlink following attempted in sticky world-writable directory by sh (fsuid ...
2
votes
1answer
1k views

Crontab Change location

I want to set a personal crontab in another folder and executed. For example I want it in /home/project/tasks/crontab Like that it's easier to add/delete tasks. Thank you for your answers.