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Here's a simple shell you can use:
Scripts starts on next line:
#!/bin/bash
ps -ef | grep -v grep | grep "some command in the process list" \
> dev/null
if [ $? -ne 0 ]; then
'put your email command here.'
fi
# End of Script
The 'ps -ef' will list all processes on the system.
The '| grep -v grep' will filter out our 'ps' process to prevent a false
positive.
The '| grep "some command in the process list"' will find, or will not find, the process you are checking.
When selecting a string to look for, keep in mind you have to look for something unique to the program you want find. A generic search for "mail" will match 'sendmail', 'qmail', etc. so try to include some white space, like: ' xmail '. Don't include dates or process numbers, as they will change.
The '\' just means continue the same command on the next line.
We redirect any output to '> /dev/null' so we don't get a email from cron every time the script runs.
The 'if [ $? -ne 0 ]; then' checks if the second grep found what we were looking for. Since we are only concerned when the process is not found, we check for a not equal to 0 return from the grep command.
Replace the 'put your email command here.' with your own email command.
Remember that cron only sets a basic environment, so if your email program is not in one the standard program dirs,
"/usr/local/bin:/usr/bin:/bin", you must use a complete path to the program, ie.: /usr/mydir/bin/myemailprog {options}
You can put more than 1 command inside the if ... fi statement.
Good luck.
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