echo "Do you really want to continue (y/n)? \c"
read answer_yes_no

#-------------------------------------------------------------------------------
# IF NOT OK, TERMINATE SCRIPT
#-------------------------------------------------------------------------------
if [[ ! $answer_yes_no = 'y' ]]
then
   echo OK. Terminated.
   exit 1
fi
_______________________________________________________________________________________________________

#-------------------------------------------------------------------------------
# LOOP ANSWER
#-------------------------------------------------------------------------------
while [[ ! $answer_yes_no = 'y' ]]
do
    echo "Do you really want to continue (y/n)? \c"
    read answer_yes_no
done
_______________________________________________________________________________________________________

#-------------------------------------------------------------------------------
# CHECK ANSWER ONLY IN NON-SILENT-MODE
#-------------------------------------------------------------------------------
export s_parm=$1

if [[ $s_parm = '-s' ]]
then
    export s_silent='y'
else
    echo "This script will delete the files listed above. Do you really want to continue (y/n)? \c"
    read s_answer_yes_no

    #-------------------------------------------------------------------------------
    # IF NOT OK, TERMINATE SCRIPT
    #-------------------------------------------------------------------------------
    if [[ ! $s_answer_yes_no = 'y' ]]
    then
       echo terminated
       exit 1
    fi
fi

echo proceeded

_______________________________________________________________________________________________________

#-------------------------------------------------------------------------------
# ANSWER WITH DEFAULT VALUE
#-------------------------------------------------------------------------------
answer_yes_no=y
echo "Do you really want to continue (y/n)? \c"
read answer_yes_no

if [[ $answer_yes_no = '' ]]
then
   answer_yes_no=y
else
   if [[ ! $answer_yes_no = 'y' ]]
   then
      echo OK. Terminated.
      exit 1
   fi
fi

echo answer is: $answer_yes_no
exit 0