Cron is a job scheduler that allows users to run commands periodically.
6
votes
2answers
3k views
Bash Script on Startup? (Linux)
Is there any way to make/run a bash script on reboot
(like in Debian/Ubuntu for instance, since thats what my 2 boxes at home have)
Also, any recommended guides for doing cron jobs? I'm completely ...
20
votes
6answers
6k views
Correct locking in shell scripts?
Sometimes you have to make sure that only one instance of a shell script is running at the same time.
For example a cron job which is executed via crond that does not provide
locking on its own (e.g. ...
8
votes
1answer
1k views
How can I execute `date` inside of a cron tab job?
I want to create a log file for a cron script that has the current hour in the log file name. This is the command I tried to use:
0 * * * * echo hello >> ~/cron-logs/hourly/test`date "+%d"`.log
...
7
votes
2answers
247 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 ...
10
votes
3answers
5k views
Does RHEL execute all cronjob files under /etc/cron.d/*?
This is a RedHat Enterprise Linux 5 system (RHEL). We manage this system using Cfengine.
We have several cronjobs which are running twice as often as usual. I checked the cronjobs under /etc/cron.d/ ...
3
votes
2answers
1k views
How to access X display from a cron job when using gdm3? [duplicate]
Possible Duplicate:
Open a window on a remote X display (why “Cannot open display”)?
I'm trying to run a cron job that needs access to my X session. I know my X session will ...
2
votes
1answer
423 views
Check for process already running in webfaction?
I use Django framework on webfaction and have 5 different cron jobs. One of them lasts much longer than others and sometimes gets stuck (30-120 seconds or more).
I have already set that cron job to ...
1
vote
3answers
478 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 ...
6
votes
2answers
10k views
How can get a list of all scheduled cron jobs on my machine?
My sysadmin has set up a bunch of cron jobs on my machine. I'd like to know exactly what is scheduled for what time. How can I get that list?
5
votes
4answers
2k views
Run script in a non interactive shell?
I have a cron job that is running a script. When I run the script via an interactive shell (ssh'ed to bash) it works fine. When the script runs by itself via cron it fails.
My guess is that it is ...
5
votes
2answers
2k views
Can I automate tar's multi-volume-feature?
Ok, so I've just had a read through this page after a way to improve my current backup solution on my Debian server. Tar seems to be offering a quite nice multi-volume feature, although when I try it ...
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 ...
2
votes
2answers
316 views
I need help with a cronjob to watch for runaway processes and kill them
I have an interesting situation, I have a runaway ruby process - I know exactly how I trigger it.
Point is, it got me thinking about runaway processes (CPU usage or memory usage).
How would one ...
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.
...
2
votes
3answers
226 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
290 views
Are changes in crontab applied when the file is saved, or when the editor is closed?
When I do crontab -e, are the changes applied immediately when I save the file, or do I have to exit vim for it to be applied?
2
votes
4answers
2k views
executing a sh script from the cron
I have a test.sh script
#!/bin/sh
php /home/v/file.php
sh /root/x/some.sh
when I execute the file as root from command line it works.
sh /home/v/test.sh
when I set it to crontab -e (is the root ...
