gistfile1.txt

LOCK=/tmp/shardbackup.lock

if [ -f $LOCK ]; then
    ps -p `cat $LOCK` > /dev/null
    if [ $? -eq 1 ]; then
        # Stale lock file
        rm $LOCK
    else
        echo "Lock file found for running process"
        exit 1
    fi
fi

# Create the lockfile
echo $$ > $LOCK