Cat with new line

Question

My input file content is

welcome

welcome1

welcome2

My script is

for groupline in `cat file`
do
        echo $groupline;
done

I got the following output.

welcome
welcome1
welcome2 

Why it is not print the empty line. I want the reason.

Answer 1

Because you're doing it all wrong. You want while not for, and you want read, not cat:

while read groupline
do
  echo "$groupline"
done < file

Answer 2

you need to set IFS to newline \n

IFS=$"\n"
for groupline in $(cat file)
do
        echo "$groupline";
done

Or put double quotes. See here for explanation

for groupline in "$(cat file)"
do
        echo "$groupline";
done

without meddling with IFS, the "proper" way is to use while read loop

while read -r line
do
 echo "$line"
done <"file"