Bash 2.0 For Loop Counter

This is the syntax you can use for a simple for loop counter in bash version 2 (e.g. on Apple OS X version 10.4):

for ((i = 1; i <= 5; i++)); do echo $i; done

Otherwise for i in {1..5}; do ... is a simpler syntax that works in newer bash versions. More details can be seen at Vivek Gite's Bash For Loop Examples.