Shell Programming and Scripting

"&&" means if the run before the "&&" is successful (returns 0) then also run what is after the "&&" otherwise do not run what is after the "&&". In other words a mail messages is sent only when the /root/find.sh script sees a *.cgi process running.

/root/find.sh needs to contain:

Code:

if [ `ps -ef|grep *.cgi|wc -l` -gt 1 ] ; then
  exit 0
else
  exit 1
fi

If you want the process line mailed also than find.sh could do:

Code:

if [ `ps -ef|grep *.cgi|wc -l` -gt 1 ] ; then
  rm /tmp/cgimailcontents 2>/dev/null
  ps -ef | grep cgi | grep -v grep > /tmp/cgimailcontents
  exit 0
else
  exit 1
fi

and the cron job would then be:

Code:

*/15 * * * * /bin/sh /root/find.sh && mail -s "CGI Script `date` `time`" <email_id > < /tmp/cgimailcontents

N.B.
1. "*/15" does not work in cron for all Unixes, you may need to (e.g. for Solaris) use "0,15,45" instead.

2. Every 15 minutes is not very frequent and if the CGI script only runs for 2 minutes you may miss it!

3. The "/bin/sh" is not necessary if the /root/bin.sh script is chmodded to be executable by user running the crontab, unless the /root/ filesystem is mounted with the -noexec option in which case the /bin/sh overcomes that!

Thank you for your detailed information.

Let me check within my box and will update you if I have any doubt...