dynamic-bash-loop-expanding.sh

#!/bin/bash
# for question at http://superuser.com/questions/1069702/how-to-expand-a-loop-iterating-over-an-array-dynamically-in-bash/1159076#1159076

req="a b c d"
read -a MODULES <<<$req

i=0
for ((i = 0; i < "${#MODULES[@]}"; i++)); do
    MODULE_NAME=${MODULES[$i]}
    echo $MODULE_NAME
    if [ i == 0 ]; then 
        MODULES+=( "e" )
        i=1
    fi
done

# should give following output: 
#
# a
# b
# c
# d
# e

# but gives following output: 
#
# a
# b
# c
# d