#!/bin/bash
HEIGHT=${HEIGHT:=25}
eof=0
while [ $eof -eq 0 ] ; do
    i=0
    while [ $i -lt $HEIGHT -a $eof -eq 0 ] ; do
        line=''
        read line
        if [ $? -eq 0 ] ; then
            printf "%s\n" "$line"
        else
            eof=1
        fi
        i=$(( $i + 1 ))
    done
    read -p 'Press RET to continue, q RET to abort:' rep < /dev/tty
    if [ "$rep" = 'q' ] ; then
        eof=1
    fi
done