An example of how to overwrite lines in the shell using a few different techniques. For further explanation: http://blog.jrbalsano.com/post/51571798768/overwriting-multiple-lines

tputlines.sh

#!/bin/sh

#Example 1 - Overwrite a line with a longer line
echo "This is a line\c"
sleep .5
echo "\rThis is another line, overwriting the last one."

#Example 2 - Overwrite a line with a shorter line
echo "This is a much longer line than the one we're about to write\c"
sleep .5
echo "\rThis is a short line"

#Example 3 - Erase a line
echo "This line is about to vanish\c"
sleep .5
echo $(tput el1)

sleep .5

#Example 4
for i in 1 2 3 4 5 6 7 8 9 10
do
  echo $(tput el1) "\r\c"
  for((j = 0; j<i; j++))
  do
    echo "=\c"
  done
  sleep .5
done

#Example 5
BLANKLINE=$(tput el1)\\r\\c
for i in 1 2 3 4 5 6 7 8 9 10
do
  echo "$BLANKLINE"
  for((j = 0; j<i; j++))
  do
    echo "=\c"
  done
  sleep .5
done

#Example 6
ERASELINE=$(tput el)
UPLINE=$(tput cuu1)
PROGRESS=""
echo "\n" # Add two blank lines to erase over. (One from \n, one from echo)
for i in a b c d e f g h i j
do
  PROGRESS+="="
  echo "$UPLINE$ERASELINE$UPLINE$ERASELINE\c" #Go up two lines, erasing them
  echo $i
  echo $PROGRESS
  sleep .5
done