Got a problem with a loop that do this for each line:
a=$(( cost + $( awk ' { print $2 } ' file) ))
awk ' $2 ~ "^[0-9]" && $2 > 0 {$2='$a';print} ' file

#!/bin/sh
cost=30
for, until, while?
do
"db update OD_LINK_COST something"
done

For troubleshoot the file looks like this
55 10
56 10
57 20
58 10
and so on