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crontab is not working!!

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Operating Systems Linux Red Hat crontab is not working!!
# 8  
Old 09-07-2011
Does your script rely on relative path names or other things that require a path? Items in cron do not get a full environment and thus need to have their variables defined more rigorously or source an environment script.

Also, how are you executing the script manually? Is there an x bit set for the user in cron?
# 9  
Old 09-07-2011
Try it like this:
Code:
*/3 * * * * /root/ping.sh > /tmp/ping.log 2>&1
*/5 * * * * /root/ntopdump.sh > /tmp/ntopdump.log 2>&1

This will redirect stdout and stderr to those 2 log files. There should be hopefully some message in them.
Also you might want to leave out the extra sh as you start a new shell anyway, with #!/bin/bash a bash, as you wrote. What's the leading "root" for?

Also in a script being issued via cron you should always use absolute paths like:
Code:
/usr/bin/wget ....

While I write this - just as people said.

There is also a good article about usage of crontab in this forum you should read:
https://www.unix.com/answers-frequent...n-crontab.html
This User Gave Thanks to zaxxon For This Post:
getrue
# 10  
Old 09-07-2011
Code:
# cat /root/ntopdump.sh 
#!/bin/bash
/usr/bin/wget -O ntop-$(date +%Y%m%d_%H:%M).php "http://127.0.0.1:3000/dumpData.html?language=php&view=short"
#

I am wondering a lot why script is not working or crontab.!!!!
# 11  
Old 09-07-2011
Let me guess, you assume it's not working because you don't see a ntop-* file anywhere in your home directory, right? That's because cron doesn't execute your script in your home directory, but in an empty temporary directory.

Tell wget to save to an absolute path, instead of a relative, and you should see your file.
# 12  
Old 09-07-2011
Also, you CAN NOT put the shebang (#!/bin/bash) on the second line. IT MUST be the first line and the first character of that line.
# 13  
Old 09-08-2011
Code:
# crontab -l
*/3 * * * * root sh /script/ping.sh >> /tmp/ping.log 2>&1
*/5 * * * * root sh /script/ntopdump.sh >> /tmp/ntopdump.log 2>&1
#

Code:
# tail -f /tmp/ntopdump.log 
/bin/sh: root: command not found
/bin/sh: root: command not found
/bin/sh: root: command not found
/bin/sh: root: command not found
/bin/sh: root: command not found
/bin/sh: root: command not found

root is not command only user!!!!
schema of the crontab picture is attached.
I have deleted root parameter from crontab and it is done. Smilie

I have changed crontab line like below but it gave same error message.
Code:
# crontab -l
*/3 * * * * root /script/./ntopdump.sh > /tmp/ntopdump.log 2>&1
#

Why root is a problem for this scenario or this redhat-release of RHEL 5.5

---------- Post updated at 05:44 PM ---------- Previous update was at 05:42 PM ----------

picture
Last edited by vgersh99; 09-08-2011 at 12:23 PM..
# 14  
Old 09-08-2011
picture is attached
crontab is not working!!-crontabjpg
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