used bash commmand lang for count iteration

#!/usr/bin/env bash

count=10

for ((i=1; i<=count; i++)); do
    echo "Iteration $i / $count"
done

#!/usr/bin/env bash

i=1
total=15

while [ $i -le $total ]; do
    echo "Step $i of $total"
    ((i++))
    # or: i=$((i+1))
done

for ((i = 0; i < 8; i++)); do
    echo "index = $i"
done

for ((i=10; i>=1; i--)); do
    echo "T minus $i..."
    sleep 1
done
echo "Go!"

# count from 0 to 100 step 10
for ((i=0; i<=100; i+=10)); do
    echo "$i%"
done

for i in {1..5}; do echo "Test $i"; done

# or with seq (more flexible)
for i in $(seq 1 2 20); do echo $i; done    # 1 3 5 7 ... 19