SHELL

two variable in for loop bash

note the commma and semi collens here

for ((i=0,j=10;i<=j;i++,j--))
do
   echo "i=$i"
   echo "j=$j"
done

i=0
j=10
i=1
j=9
i=2
j=8
i=3
j=7
i=4
j=6
i=5
j=5

# something complex

somethong omp
$id1=120
$id2=170
##
for (( a=$id1, b=$id2;  a < 59  + $id1 && b < 61 + $id2; a=$((a+10)), b=$((b+10)) ));
do
        echo "d1 = $a d2 = $b "
done
####