I am reading file and extracting the paragraph between START and END tags.

contents of abc.txt
Remember that $ means the last line in a file. You can also specify a range based on two regexps. Try
START
Note that this prints all blocks starting with lines containing regexp1
through lines containing regexp2, not just the first one. If there isn't a matching regexp2 for a line containing regexp1, then we get all lines through to the end of the file.
END

but the content of the output i am getting is without newline.

I get the ouput as the regexp is.but without a newline at the end of the line to each line.


How do i get the output each line ending with newline.

Looks flawless. Your textfile might have something else but newlines that is not recognized by sed (maybe crlf ie. ^M from windows?).
Do an
If the newlines show up as single "\n", then I don't know what's wrong.