I have a script which read a file it does
while read -r line, then i echo line out
echo "$line"

Problem is the echo does not echo space and tabs at the end of each line. How do i get the end of line space as well

Try :

while IFS= read -r line
do
   echo "[$line]"
done

If you simply want to echo each line out with its tabs and spaces on the end of each line then you can use nawk: -

nawk 1 file

I am processing each line, so i need to need to do it another way

I thought you must be but what are you doing with it?

If you post your code you are more likely to get a useful answer....

# cat file
test line1
test line2

# cat file | od -c
0000000    t   e   s   t       l   i   n   e   1  \t  \n   t   e   s   t
0000020        l   i   n   e   2  \t  \n
0000030

# while IFS= read -r line;do echo $line | od -c ;done < file
0000000    t   e   s   t       l   i   n   e   1  \n
0000013
0000000    t   e   s   t       l   i   n   e   2  \n
0000013

# while IFS= read -r line;do echo "$line" | od -c ;done < file
0000000    t   e   s   t       l   i   n   e   1  \t  \n
0000014
0000000    t   e   s   t       l   i   n   e   2  \t  \n
0000014

nawk 1 file | do your processing