Find and replace some line

Shell Programming and Scripting
1

Hi all

I have a file which has n no. of lines. I want to find string called "John"

and add 5 lines below the string. Help me to do it using script?

2

Hi

awk 'BEGIN{OFS="\n"}
$0 ~ /john/{t=1;}
t==1{print;print "line1","line2","line3",line4","line5";t=0;next}1' filename

Thanks
Penchal