I have a file containing the following lines:

first line
second line
third line
something goes here
something else goes here
something goes here
first line1
second line2
third line3

I need to go through the file and retrieved these lines and print them the output should look like this:

first line
second line
third line
first line1
second line2
third line3

Please help me get start it. I used while loop but the output wasn’t what I want it.