Hi@akhtar,
The lineinfile module will search a file for a line, and ensure that it is present or absent. This is primarily useful when you want to change a single line in a file only. See the replace module if you want to change multiple, similar lines or check blockinfile if you want to insert/update/remove a block of lines in a file. For other cases, see the copy or template modules. You can also go through the below document for more information.
https://docs.ansible.com/ansible/2.4/lineinfile_module.html