You can add this code snippet to your script:
Code:
        ####### Cleanup Network Logs ######
        ###########   Start   #############
        for file in `ls $NET_DIR/*.log`
        do
          if [ `ls -ltr $file|awk '{print $5}'` -gt 10485760 ] # 10MB
          then
            NEWFILE=$file.`date +%m%d%y`
            cp -p $file $NEWFILE
            cp /dev/null $file
            echo "Log File Moved: $file"
            gzip $NEWFILE
            find $NET_DIR -name "*.gz" -mtime +60 -exec rm {} \; 2>/dev/null
          fi
        done