You don't need the semicolons if you prefer newlines. e.g. let total=0 let n=10 for ((i=0; i<n; ++i)) do if (( i % 2 != 0 ))

You don't need the semicolons if you prefer newlines. e.g. let total=0 let n=10 for ((i=0; i<n; ++i)) do if (( i % 2 != 0 )) then printf 'Odd: %.3d\n' $i fi let total+=i done echo "Total is: $total, average is $((total / n))"