On Mon, 31 Jul 2006, David wrote:

> pid=`/bin/ps -e | grep process_name | grep -v mon | grep -v grep | sed 
> -e 's/^ *//' -e 's/ .*//' | head -1`

There is a possibility that the return is empty (so the variable named 
"pid" does not have a value).

>     if [ "X$pid" != "X" ]

So check here.
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