Update the file in-place

check_status.sh

@@ -33,5 +33,7 @@ check_ip() {
 
 while IFS=',' read -r lat lon company city ip status version; do
     new_status=$(check_ip "$ip" 18030 5 2)
-    echo "$lat,$lon,$company,$city,$ip,$new_status,$version"
-done < nodes.dat
+    sed -i.bak "/$ip/s/$status/$new_status/" nodes.dat
+done < nodes.dat
+
+rm nodes.dat.bak