password=boom
n=0
for n in 1 2 3
do
read -ep "Code: " code
[ "$code" = "$password" ] && break
done

if [ "$code" = "$password" ]
then

case $1 in
-o) shift ;;
*) set -- /dev/stdin ;;
esac

while IFS= read -r
do
: do whatever with "$line"
done < "$1"

Calling sed six times???? AARRGGHH!!!

If you know there are going to be six lines (or only need the first six):


{
read obyte1
read rbyte1
read snapt1
read obyte2