Replace a number with sed/awk

Question

I need to replace a number using a script, I am using the following command

 for ((i=1; i=<10, i=i+1))
sed '244s/0.8/(0.$i)/' analyze3big.f >> $i.f 

But for some reason it does not work.

Answer 1

Strong quotes (') prevent variable expansion. Use weak quotes (") instead:

for i in {1..10}; do
    sed "244s/0\.8/(0.$i)/" analyze3big.f >> $i.f 
done