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Shell Programming and Scripting

Script not checking previous instance run

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# 1  
Old 06-17-2012
Tools Script not checking previous instance run
Hi All,

I have developed Smilie a script that should run only if previous instance has stopped .
But illogically Smilie my script runs even if previous instance is running .I am not sure Smilie what is going wrong Smilie , please help.

Code:
#!/bin/ksh
HOME=/fs159/Purgingbackup/UPW/Purging
SCRNAME=`basename $0.ksh`

#Run the backup 
RunBackup()
{
    cd $HOME
    echo $$ > $HOME/${SCRNAME}.run
    java -Xms262144K -Xmx524288K -jar "Backup_Purge8_4thApr.jar" backup
}

#Check if previous instance of the script for supplied request ID is still running
if [ -s $SCRNAME.run ];
then
    ps -p `cat $HOME/${SCRNAME}.run` > /dev/null
    if [ $? -eq 0 ];
    then
        echo "$0 is already running...terminating current run"
        echo "$0 Utility Ends -  " `date '+%m/%d/%y %H:%M:%S'`
        echo "================================================"
        exit 0
    else
        echo "RUN file for the script was pending but the script was not running...deleted RUN file"
        rm -f $HOME/${SCRNAME}.run
    fi
fi

RunBackup

Please help me.Smilie.
Last edited by pludi; 06-17-2012 at 07:32 AM..
# 2  
Old 06-17-2012
Are you sure the script is still running in background when you trigger it again?

It seems to be working fine on my system (I substituted the java command with an infinite loop to test it)
# 3  
Old 06-18-2012
Full path? There is no "cd" before the "if" test. Also lose the trailing semi-colon on this and the other "if" test.
Code:
if [ -s $HOME/$SCRNAME.run ]

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