why empty line is not getting stored in variable

Question

I am using below code

    #! /bin/bash
for host in $(cat ./server.txt)
do 
    echo \"$host\"

done

server.txt contains :

Answer 1

Alternative

s=$(cat -E ./server.txt) 
while [ ${#s} != 0 ]
 do
  echo ${s%%\$*}
  s=${s#*\$}
 done

Answer 2

while read host; do echo "$host"; done < server.txt

With the code you provided, the file as a single string is given as the 4th argument to the for command. The shell then splits the string using arbitrary whitespace as a delimiter (assuming you have not altered the IFS variable).

Answer 3

empty lines are not there because they are considered whitespaces used to separate word values.

use this:

awk '{print $1}' server.txt

 server1.com
 server2.com

 server3.com


 server4.com