Add a word at the beginning of the line in a text file

Question

Search for the group of lines starting with "zone" and add a word "Heading" at the beginning of the previous line. Thanks for your help in advance

Code:

    Zoning A
     zone zonename1
     zone zonename2
     zone zonename3

   Team B
     zone zonename4
     zone zonename5

Desired output:

     Heading Zoning A
       zone zonename1
       zone zonename2
       zone zonename3

     Heading Team B
        zone zonename4
        zone zonename5

Answer 1

Using awk. As long as the group heading doesn't start with word zone:

$ awk '
/^ *zone/&&p!~/^ *zone/ {
    sub(/^ */,"&Heading ",p)
}
NR>1 { print p }
{ p=$0 }
END { print p }
' file
    Heading Zoning A
     zone zonename1
     zone zonename2
     zone zonename3

   Heading Team B
     zone zonename4
     zone zonename5