topic Re: Find out cron stated in Operating System - HP-UX

Find out cron stated

Ralf Buchhold — Wed, 23 Mar 2005 05:55:06 GMT

Hello
I must find out whether a shell-script is started by a cron job or by manually by root or an other user.

Thanks
Ralf

Re: Find out cron stated

Joseph Loo — Wed, 23 Mar 2005 05:58:44 GMT

hi,

/var/adm/cron/log will tell u whom and when a cronjob was fired.

regards.

Re: Find out cron stated

Ralf Buchhold — Wed, 23 Mar 2005 06:02:14 GMT

Sorry
I mean to find it out in the script file to do different actions.
Ralf

Re: Find out cron stated

Sanjay Kumar Suri — Wed, 23 Mar 2005 06:02:36 GMT

Look for #crontab -l (if the job is defined).

Also check cron log /var/adm/cron/log

sks

Re: Find out cron stated

Peter Godron — Wed, 23 Mar 2005 06:20:45 GMT

Ralf,
goto the directory where all the crontabs are held and search for your shellscript:
cd /var/spool/cron/crontabs
grep shell-scriptname *

Is the script being executed on a regular basis? If yes then its most likely cron or 'at'.

Regards

Re: Find out cron stated

john korterman — Wed, 23 Mar 2005 07:44:12 GMT

Hi,
perhaps you can make use of the stty command: if you execute "stty -a" in the script and it does not return 0, it must be because no (controlling) terminal is attached - hence I would argue that the script must have been executed from cron.
Just an idea - perhaps other members have obvious arguments against this.

regards,
John K.

Re: Find out cron stated

Mark Ellzey — Thu, 24 Mar 2005 09:58:44 GMT

Ralf,

Whenever I write a script that can be run either interactively or from cron, I check the $TERM variable. If it has a value, then the script is being run interactively. If not, it's being run from cron or at. Based on that test, I either echo stuff to the terminal, or echo stuff to a log file.

Regards,
Mark

Re: Find out cron stated

A. Clay Stephenson — Thu, 24 Mar 2005 10:31:07 GMT

The "standard" way of doing this is to determine if stdin (file descriptor 0) is a tty (terminal) device.

if [ -t 0 ]
then
echo "I'm connected to a terminal. I must be interactive"
else
echo "No terminal"
fi

Man test for details.