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

awk -v insert=giraffe -v before=cat '
  $1 == before && ! inserted {
    print insert
    inserted++
  }
  {print}
' BestAnimals.txt > NewBestAnimals.txt