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Help with multiple instance script checking

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# 1  
Old 11-10-2009
Question Help with multiple instance script checking
I am trying to debug the following script. It appears that when the check for script running occurs, it's finding the actual grep statement and causing the script believe the script is already running. This is deployed on two different servers where one works fine, the other doesn't. Any ideas?

# -- Check to see if this script is already running.
PROCESS_ID=`ps -eaf | grep $scriptname | grep -v "grep" | awk '{ print $2 }'`
if [ ! -z "$PROCESS_ID" ]; then
Total=`echo $PROCESS_ID | wc |awk '{ print $2 }'`
if [ $Total -gt 1 ]; then
echo "WARNING: This script may already be running as process id(s) $PROCESS_ID."
echo "Stopping this script."
exit 99
fi
fi
# 2  
Old 11-10-2009
The code:

Code:
ps -ef | grep process | grep -v grep

Is quite normal for what you are trying to achieve, not sure what the "a" parameter is adding?
I would compare what the output from "ps -eaf" looks like on each server and make sure they are identical.

Another method to achive the above (not so simple whjen the process name is a variable) is:

Code:
ps -ef | grep [f]irefox

# 3  
Old 11-10-2009
Try this (can shorter ?)
Code:
pidof -x -o $$ ${0##*/} && exit

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