Cron is a job scheduler that allows users to run commands periodically.
2
votes
1answer
196 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 ...
1
vote
2answers
203 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?
0
votes
1answer
1k views
Crontab job start +1 min after @reboot
Need a script executed at each reboot in +1 minute. I placed a record @reboot but it is too early for my script. How to execute it sometime after reboot?
0
votes
1answer
74 views
run-parts ignores jobs.deny
I use run-parts to run all scripts under a directory,the same way crontab does. But the jobs deny and jobs allow don't block any of the scripts in the directory.
rajeevs@rajeev:/home/rajeevs/test$: ...
4
votes
3answers
169 views
Have cron email output to MAILTO based on exit status
I have a cron job running a php command like this:
php /path/to/script.php > dev/null
This should send only STDERR output to the MAILTO address. From what I gather the php script is not ...
1
vote
2answers
189 views
how do I run a cron job with a specific user?
My cron and scripting skills are very poor, but I need to run a job every 5 minutes by user 'cpc'. So I created a script and left it at /root.
My crontab -e entry about it is:
0-59/5 * * * * ...
7
votes
2answers
250 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 ...
2
votes
2answers
84 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 ...
-2
votes
4answers
679 views
Cronjob for rebooting everyday
I have set this cronjob because I want my server to be rebooted everyday at 05:00
# file: /etc/cron.d/reboot
* 5 * * * root reboot &> /dev/null
I think it worked the first time as I was ...
1
vote
0answers
289 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
206 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 ...
4
votes
3answers
128 views
How to get which version of cron daemon is running
Background: I am working on CentOS
Details
# cat /proc/version
Linux version 2.6.18-308.4.1.el5PAE (mockbuild@builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-52)) #1 SMP Tue Apr 17 ...
2
votes
1answer
178 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
...
1
vote
2answers
512 views
Watchdog script to keep an application running
I currently use an application called MxEasy on my linux servers to display video from a couple of IP cameras. The software is rather buggy and crashes occasionally. I've wrote a script that checks to ...
-4
votes
2answers
249 views
Who can use cron? I can't help myself. Who is using cron? [closed]
I want to run cron every minute OR hour xclock.
It's not that simple as I guessed:(
I'll wait for your answer, sir. Maybe It'll be too late, before the right answer as 1 2 3...
2
votes
3answers
231 views
crontab -e , then 0 * * * * = every hour; then xclock
After sudo crontab -e
(it wrote "/tmp/crontab.XXXX70pN9h" 1L, 19C 1,1 All
Then I saved the file. And to check..? (how? i don't know)
And to check I
ps -e | grep cron
29818 ? ...
2
votes
1answer
158 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 ...
1
vote
2answers
213 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 ...
2
votes
1answer
378 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 ...
1
vote
1answer
187 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
158 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 ...
3
votes
1answer
1k views
How to redirect output to a file from within cron?
I have a backup script which I need to run at a particular time of a day so I am using cron for this task and from within cron am also trying to redirect the output of backup script to a logfile.
...
0
votes
1answer
165 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:
...
2
votes
3answers
716 views
Conditional crontab command in bash script
How do I invoke a crontab command so that I can schedule to run a script with a 20 minute delay based on some condition?
Edit: What if I wanted a command that schedules a script to be executed only ...
6
votes
2answers
2k views
Manually run a cron job / simulate running cron job?
I am new to cron and I want to test if cron's mailing stuff after an executed task and things like that work. Is there a more elegant way to test this, then setting a cron job to run every few ...
1
vote
1answer
169 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
2answers
118 views
How to schedule a job that depends on network availability?
I have cloned a git repository of some project. I want to automate git pull and compile the project once in a week. I am using a laptop which wont be on 24x7.
Now, I cannot use cron as I should keep ...
2
votes
1answer
2k views
Why does cron silently fail to run sudo stuff in my script?
I have a script run from a non-privaleged users' crontab that invokes some commands using sudo. Except it doesn't. The script runs fine but the sudo'ed commands silently fail.
The script runs ...
4
votes
1answer
131 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 ...
0
votes
1answer
182 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 ...
4
votes
3answers
693 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:
...
5
votes
2answers
591 views
Run Script once a day with systemd
I want to run a backup script 10 minutes after booting up my machine but only once a day. Is it possible to build up such scenarios with systemd?
1
vote
1answer
174 views
How do I push a Mercurial repository to BitBucket over ssh?
I created a public key for ssh and registered that key with BitBucket. I then attempted to push:
$ hg push ssh://jhayward@bitbucket.org/johncharrell/[project name]
pushing to ...
1
vote
3answers
490 views
What's wrong with these two cron job's?
I have the following cron jobs defined.
55 8 * * 3 /usr/bin/php /home/mark/dev/processes/customClient/events.php > /home/mark/dev/processes/customClient/events-`date +%Y-%m-%d ...
1
vote
3answers
788 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 ...
4
votes
3answers
853 views
Check if script is started by cron, rather than invoked manually
Is there any variable that cron set when it's running a program ? If the script is running by cron, I'll skip some parts; otherwise invoke those parts.
How can I know if the bash script is started by ...
2
votes
2answers
350 views
Cron to delete particular file(s) from a specific directory
I am new to shell scripting. I am trying to write a cron for unix shell that will delete some files, say after 2 weeks or after 1 month from a specific directory.
/somedir1/somedir2/
if(somedir2) ...
0
votes
1answer
184 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.
...
4
votes
1answer
110 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 ...
1
vote
1answer
615 views
Run gui application on startup
I can run a script at boot by adding the following line to my crontab:
@reboot perl /path/script
That works fine. But the problem arises when I try to run a gui application such as gmail notify. It ...
3
votes
1answer
350 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 ...
0
votes
2answers
570 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 ...
26
votes
12answers
2k views
Run unix command precisely at very short intervals WITHOUT accumulating time lag over time
Question
I'd like to be able to run a UNIX command precisely every second over a long time period.
I need a solution, which does not lag behind after a certain time, because of the time the command ...
4
votes
2answers
165 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, ...
4
votes
1answer
1k views
how can I make cron run a job right now, for testing/debugging? without changing the schedule!
I have a cron job that is scheduled to run everyday, other than changing the schedule, is there any other way to do a test run of the command right now to see if it works as intended?
5
votes
2answers
473 views
What could cause a cron to run twice at the same moment?
I have a cron that is setup to run every Monday at 1 AM
0 1 * * 1 /script/dir/script >> /script/dir/file.log
After two years of running as expected, it ran twice on June 18, with the second ...
4
votes
2answers
1k 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 ...
2
votes
2answers
835 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
2answers
437 views
How can I get crontab to use a different PHP installation location?
I have a MAMP setup which runs PHP 5.3.5 on my Mac OS X 10.5 computer. I am trying to install a crontab that executes a PHP script, which is located on my MAMP server. I can only get the crontab to ...
8
votes
1answer
618 views
Suppress output unless non-zero exit code
What's the best way to suppress output (stdout and stderr) unless the program exits with a non-zero code? I'm thinking:
quiet_success()
{
file=/tmp/suppressed
if ! ( "$@" > "$file" ...
