demo script

#!/bin/bash

GREEN='\033[0;32m'
CYAN='\033[0;36m'
NOCOLOR='\033[0m'

filename="$1"
cat "$filename" | while read LINE
do
    if [[ $LINE == \#* ]] ;
    then
        echo -e "${CYAN}$LINE ${NOCOLOR}"
        read -s pause </dev/tty
    else
        echo -e "${GREEN}# $LINE ${NOCOLOR}"
        eval "$LINE"
        read pause </dev/tty
    fi
done < "$filename"