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Problems with a .sh file in cron

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Operating Systems Linux Ubuntu Problems with a .sh file in cron
# 8  
Old 11-26-2011
Am I having eyesight trouble or what is that root before tempcheck ?

I would redirect STDOUT and STDERR in two separate files to see what is happening
This User Gave Thanks to vbe For This Post:
Rautoner
# 9  
Old 11-26-2011
I think vbe has spotted it. Perhaps your Ubuntu has a normal unix crontab syntax which does not contain the username field (i.e. "root"). Is the crontab you are editing called "root". Are there any other entries in the file which could use to compare.

You can't beat actually posting the error messages verbatim. The 127 error means that cron can't find the file to be executed. The error suggests that it may be trying to execute a file called "root"? The MTA error means that cron can't find your Mail Transport Agent - maybe because you don't have email configured?
This User Gave Thanks to methyl For This Post:
Rautoner
# 10  
Old 11-27-2011
I know that I don't have my mail configured because I've never had to. Where do I configure it? I know how to run servers and websites, not errors on linux Smilie I'll remove the 'root' before the file and see what the syslog says. Also, the crontab I'm editing isn't called root, I just use 'crontab -e' to edit it. Oh, and should I put all these in the root's crontab (sudo crontab -e), so that it won't have a problem running the script, as I know that hddtemp and poweroff will need to be root.
By the way, what does verbatim mean?

---------- Post updated at 07:11 PM ---------- Previous update was at 07:01 PM ----------

Same thing. Here's the current syslog:

Code:
Nov 26 19:09:01 server CRON[25789]: (root) CMD (  [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir fuser -s {} 2>/dev/null \; -delete)
Nov 26 19:09:01 server CRON[25790]: (server) CMD (/home/server/tempcheck >> /home/server/cronlog.txt)
Nov 26 19:09:01 server CRON[25788]: (CRON) error (grandchild #25790 failed with exit status 127)
Nov 26 19:09:01 server CRON[25788]: (CRON) info (No MTA installed, discarding output)
Nov 26 19:10:01 server CRON[25993]: (server) CMD (/home/server/tempcheck >> /home/server/cronlog.txt)
Nov 26 19:10:01 server CRON[25992]: (CRON) error (grandchild #25993 failed with exit status 127)
Nov 26 19:10:01 server CRON[25992]: (CRON) info (No MTA installed, discarding output)

---------- Post updated 27-11-11 at 03:21 PM ---------- Previous update was 26-11-11 at 07:11 PM ----------

I solved it!
Thanks for your help guys. I amended the script like so:

Code:
#!/bin/bash

TEMPERATURE=$(/usr/sbin/hddtemp /dev/sda | cut -d: -f3 | sed 's/..$//' | sed 's/ //')
echo $(date '+DATE: %m/%d/%y  TIME:%H:%M:%S') - Temperature was: $TEMPERATURE >> /home/server/templog.txt
if [ $TEMPERATURE -ge 50 ]; then
/sbin/poweroff
fi

and the crontab file like so:

Code:
*/5 * * * * /home/server/tempcheck.sh >> /home/server/templog.txt

# 11  
Old 11-27-2011
Setting files owned by root to 777 is a disaster waiting to happen. NEVER do this.

If it is owned by root and 777, anybody can rewrite your file and you will run it, as root.

Imagine what this would do to your system:

Code:
dd if=/dev/zero of=/dev/sda


You really should not do this.
Last edited by mark54g; 11-27-2011 at 04:35 PM.. Reason: explanation
# 12  
Old 11-27-2011
Verbatim is a word means "repeating the exact words that were used". When dealing with computer error messages you must report the whole message exactly as it appeared on the screen - complete with all punctuation, space characters, upper/lower case etc..

Glad it's working. The "man" pages for Ubuntu cite two different formats for a crontab file (without and with a username). I'm glad that yours is a normal "unix" format crontab.

Setting up basic unix mail should be straightforward. Source a "how to" manual for your Operating System. Internet mail is more difficult and will depend on your environment.
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