Insert text before a certain line using Bash

Question

How can I insert a set of lines (about 5) into a file at the first place a string is found?

For example:

BestAnimals.txt

dog         


        

Answer 1

If you know (or somehow find out) the line:

sed -n '/cat/=' BestAnimals.txt

You can use sed:

sed -i '2i giraffe' BestAnimals.txt