Topic: cron problems
started by: Big_Pc_Man
Posted by Big_Pc_Man on July 25 2007,01:45dsl version 3.4
Seems there are two crontab choices: /opt/crontab and etc/crontab (symlink back to /knoppix/etc/crontab)
Both files are under root/root.
When executed in aterminal as su, they both come back with line1: ./events: permission denied.
Any ideas as to what is going wrong?
Posted by roberts on July 25 2007,04:43And /KNOPPIX/etc/crontab links to /opt/crontab, all the same file.
Cron is too big to be in DSL and instead we use a perl script called MyCron located at /usr/local/bin
Start with the boot code cron or manually with:
Then take a look at /tmp/crontest to see the default test
Use your favorite DSL editor to edit /opt/crontab
Posted by Big_Pc_Man on July 25 2007,11:31Thanks. When I activate mycron through the control panel it"freezes" up and I end up having to kill the panel process. By this I mean I can't access anything else in the panel like system stats to view what processes are running. Any ideas?
Posted by roberts on July 25 2007,14:31Ah, yes!
The startup command within DSLpanel needs to be changed to "sudo MyCron &"
Posted by Big_Pc_Man on July 25 2007,17:32Wow - MyCron is not happy with me!
By the way thanks for all the help.
1. I have changed the crontab file to be 2 * * * * /opt/myscript.sh
2. myscript is:
/opt/wget -v --output-document=/opt/myscript.log < http://www.mysite.com > >> /opt/terminalout.log 2>&1
3. Ran the script from the terminal and it works fine. Everything goes to the proper place.
4. As su in aterminal: /usr/local/bin/MyCron &
response:  2854
second response: Argument """" isn't numeric in sprintf at /usr/local/bin/MyCron line 73, <CT> line 1.
Argument /opt/ isn't numeric in sprintf at /usr/local/bin/MyCron line 73, <CT> line 1.
At this point the cpu is running at 100% so I killed 2854 to get the system back.
What the heck is going on?
Well Ok another dumb mistake. There are 6 fields for the time trigger and I only had 5 in crontab.
Posted by lucky13 on July 25 2007,18:57
The only dumb mistakes are the ones you refuse to stop making. The rest are learning experiences.
Posted by bpsg119 on Oct. 08 2007,13:37I feel like an idiot, but why does this script have 6 time fields when the cron only has 5?
I've added another * to the end of the other 5 and things seem to work from initial testing, but I haven't found documentation on the6th field.
Posted by roberts on Oct. 08 2007,15:04As shown in the perl script, /usr/local/bin/MyCron uses a slightly enhanced crontab
Posted by bpsg119 on Oct. 08 2007,16:46
Ok,thanks for that, I should have seen that when I was looking at the script while I was getting errors.
Correct me if I'm wrong, but it appears that the second and third examples in the text from the script that you posted only contain 5 fields before the command. If this is allowed, why would my old crontab with 5 fields throw an error until I entered the 6th field?
Thanks again for your help
Posted by roberts on Oct. 08 2007,23:14I didn't write the script. Just posted that comment section. But I would say you are correct. The only thing that I contributed was the sample test crontab
* * * * * * echo Cron timestamp `date` >> /tmp/crontest
Which has six.