topic Re: Cron is not working... in Operating System - Linux

Cron is not working...

praveen.. — Wed, 13 Dec 2006 03:34:37 GMT

Hi,
I am able to execute 1 script using #./tmp/script.sh

and can get the desired output on my email.

I want to run this script in every 15 minutes so i made some entries in crontab file

# crontab -e
00,15,30,45 * * * * /tmp/script.sh

But now i am not getting any mail
# ps -ef | grep -i cron
root 3348 1 0 Nov30 ? 00:00:00 crond
root 31075 23905 0 02:34 pts/7 00:00:00 grep -i cron
#

Please suggest

Re: Cron is not working...

praveen.. — Wed, 13 Dec 2006 03:50:54 GMT

Now I tried with...

* * * * * date > /tmp/cron.test

in crontab file

and it is working fine...

Please suggest

Re: Cron is not working...

George Liu_4 — Wed, 13 Dec 2006 09:14:41 GMT

1. add
MAILTO=
to explicitly assign the mail user;

2.
check /var/log/crontab to see your cronjobs had been invoked

Re: Cron is not working...

George Liu_4 — Wed, 13 Dec 2006 09:15:49 GMT

correct on my last post.
it should be
/var/log/cron

Re: Cron is not working...

Stuart Browne — Wed, 13 Dec 2006 18:17:35 GMT

Does '/tmp/script.sh' rely upon a given PATH being set?

Generally, only a bare-minimum of PATH is set in the cron environment.

Basically, you've got two choices:

1) Make sure the path you require is set within the script.

2) Absolutely-path every command you call.

Re: Cron is not working...

praveen.. — Fri, 15 Dec 2006 04:05:32 GMT

#tail -10 /var/log/cron
Dec 15 02:50:01 hostname crond[11336]: (root) CMD (/opt/wlserver/ldm1v4.sh)

I am getting this message on every minutes.

/opt/wlserver/ldm1v4.sh is the script which i am trying to execute using cron.

where i need to add "MAILTO"?

I think path is set because if i give this command..
#/opt/wlserver/ldm1v4.sh

then script is successfully executing.

please suggest
thanks

Re: Cron is not working...

Stuart Browne — Sat, 16 Dec 2006 02:53:05 GMT

If you're getting that message every minute, then you're executing that script every minute.

As this isn't "/tmp/script.sh", I don't see how that's relevant.

Now, back to the PATH issue. Executing a command from the command line *IS NOT THE SAME* as having it execute from cron.

The PATH environment variable is different. STDIN, STDOUT and STDERR are different when executed from cron. Lots of things are different when executed from cron.

Re: Cron is not working...

Alpha977 — Sat, 16 Dec 2006 12:19:30 GMT

hello!

i think the syntax is incorrect.
Try first with a classical command, without comma, example:
10 4 1 * * /tmp/script.sh

Then, check if you have cron.allow file.

Bye

Re: Cron is not working...

Atul Gautam — Mon, 18 Dec 2006 09:19:48 GMT

Praveen,

Alpha is correct.

The syntax that you have used in the crontab file is incorrect.

The format which Alpha has also mentioned will be ---

15 * * * *
Then restart your crond service and then see if it gets executed or not.....

Also you can check your cron jobs using crontab -l command

Atul

Re: Cron is not working...

Stuart Browne — Mon, 18 Dec 2006 17:02:57 GMT

Alpha, Atul, you're both wrong.

There's nothing wrong with a comma-delimited set of minute values. Go back and re-read your man pages.

Also, if using 'crontab -e', the '/etc/crontab' file or '/etc/cron.d/' structure, there's no need to restart 'crond'.

Re: Cron is not working...

praveen.. — Tue, 19 Dec 2006 01:51:22 GMT

so please let me know how to ser PATH environment variable

Thanks

Re: Cron is not working...

Stuart Browne — Tue, 19 Dec 2006 04:20:12 GMT

2nd line of your script:

PATH="/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin"

that sort of thing.

Do 'echo $PATH' in the shell to get what it's currently set to.. copy/paste that in.

Re: Cron is not working...

praveen.. — Tue, 19 Dec 2006 05:34:02 GMT

I have set the PATH in my script,
but still that script is not running using cron.

if i execute this script using #./script.sh
, I am getting the correct output.

when i am using cron....even I am not getting any thing in /var/log/maillog

(This script send me the output to my email id)

Please suggest

Re: Cron is not working...

Stuart Browne — Tue, 19 Dec 2006 06:42:41 GMT

What's the first line of the script file?

Re: Cron is not working...

praveen.. — Tue, 19 Dec 2006 06:57:58 GMT

This script is for to find a process "ldm1v4" whether it is running or not?

if the process is not running, script will send the email. (mailfile is a script to send the emails)

# cat ldm1v4.sh

PATH="/home/db2home/SymphonyRPM/Server/Python23:/home/db2home/SymphonyRPM/Share:/home/db2home/SymphonyRPM/Server/ldap:/home/db2home/SymphonyRPM/Server/stubs::/home/db2home/SymphonyRPM/server:/home/db2home/SymphonyRPM/server/Python23:/home/db2home/SymphonyRPM/share:/home/db2home/SymphonyRPM/server/ldap:/home/db2home/SymphonyRPM/Server/stubs::/usr/local/nz/bin:/opt/CA/SharedComponents/dmscript/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/root/bin"
NUM_PROC=$(ps -ef |grep -c ldm1v4)
if [[ $NUM_PROC = 1 ]]
then
/opt/wlserver/mailfile_ldm1v4.sh praveen@hp.com root@hostname.company.com 1 2 `hostname`::wlserver process is running
fi

and I also tried with #!/bin/sh

# cat ldm1v4.sh
#!/bin/sh
PATH="/home/db2home/SymphonyRPM/Server/Python23:/home/db2home/SymphonyRPM/Share:/home/db2home/SymphonyRPM/Server/ldap:/home/db2home/SymphonyRPM/Server/stubs::/home/db2home/SymphonyRPM/server:/home/db2home/SymphonyRPM/server/Python23:/home/db2home/SymphonyRPM/share:/home/db2home/SymphonyRPM/server/ldap:/home/db2home/SymphonyRPM/Server/stubs::/usr/local/nz/bin:/opt/CA/SharedComponents/dmscript/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/root/bin"
NUM_PROC=$(ps -ef |grep -c ldm1v4)
if [[ $NUM_PROC = 1 ]]
then
/opt/wlserver/mailfile_ldm1v4.sh praveen@hp.com root@hostname.company.com 1 2 `hostname`::wlserver process is running
fi

If i give the command...
#./ldm1v4.sh

I got the desired result
this script is not working with cron

Please suggest

Re: Cron is not working...

Stuart Browne — Tue, 19 Dec 2006 07:26:23 GMT

That should be working.

Check the messages file for any cron errors, restart crond, ensure that 'crontab -l' shows the right stuff, that the file is actually there and is executeable (+x), that the security policy allows for it to execute outside of a shell (audit.log possibly)...

Time to grasp at straws.

Re: Cron is not working...

George Liu_4 — Tue, 19 Dec 2006 09:23:51 GMT

At this time, I hope your cronjob works fine.
BUt If it is not, follow the steps below:

1. in file /var/log/cron, check your script/cronjob has been started

2. If not, check your crontab syntax

3. If yes, append ">>& /tmp/cron.log" on the problematic entry of your crontab, and add some debug info in your script

What's your shell? is it bash or csh? The path setting is different.

Re: Cron is not working...

praveen.. — Thu, 21 Dec 2006 01:28:48 GMT

I needed to use...if [[ $NUM_PROC == 1 ]]
while I was using ...if [[ $NUM_PROC = 1 ]]
in my script..

Thanks everybody :-)