how to add line in file .
Insert lines should not open ,then add the lines in file .Without modify old lines,then below tasks need to do as per requirements,
1. First need to the line first line,
2. First need to add the line end ,
3. Find the word , then add desired line .
finally need to verify the lines add properly or not and without junk characters.
If anyone knows could you please share your valuable information.
use "sed" for all this requests, for further information use man sed or have a look into
http://www.yourownlinux.com/2015/04/sed-command-in-linux-append-and-insert-lines-to-file.html as example.
This looks and feels like writing somebody else's homework, which may be interesting to some degree at times. It is also amusing how unclear the question is, terrible formulation.