Linux/Unix Shell Scripting - como salir de un while para proseguir el flujo?

count=14

lista=25

if [ $count -le 33 ]

then

  while [ $count -le 33 ] ;do

VARIABLE1="fila$count"

VARIABLE2=" $(head -$count lista$lista.txt | tail -1)"

sed -i "s/$VARIABLE1/$VARIABLE2/g"  pag$lista.html

let count=$count+1

done

    let lista=$lista+1

fi

#!/bin/bash

while :

do

    read -p "Entra dos numeros a sumar ( - 1 to quit ) : " a b

    if [ $a -eq -1 ]

    then

        break

    fi

    ans=$(( a + b ))

    echo $ans

done