So?

So just write it.

...oh, you hoped we would write it for you?

Wrong!

So, perhaps you should use Search (entering "extract a line" in the "Search" box above produces useful results) or Super_Search for the answers to this oft-repeated question. And if that doesn't avail, you should definitely show a bit of effort (i.e. show us some code).

See, please How do I post a question effectively?, On asking for help and, not just incidentally, Writeup Formatting Tips.

Welcome to the Monastery. Reading the tips above will warm that welcome.