regex - Inserting text below and above a matched pattern -

first of all, such wonderful community have!! have been benefited great knowledge shared here on stackoverflow.

coming problem facing:

i have bunch of files(about 200) in files wanted search pattern(multi-line) , if pattern matches, want add text above , below pattern.

e.g

file1.cpp

#ifndef file1_h #define file1_h  #ifndef parent1_h #include "parent1.h" #endif  #ifndef sibling_h #include "sibling.h" #endif  #ifndef parent2_h #include "parent2.h" #endif  class file1 { };  #endif     

in file wanted add #ifndef noparent above #ifndef parent1_h , #endif below #endif right below parent1.h.

i want same thing #ifndef parent2_h

so output like:

#ifndef file1_h #define file1_h  #ifndef noparent #ifndef parent1_h #include "parent1.h" #endif #endif   #ifndef sibling_h #include "sibling.h" #endif  #ifndef noparent #ifndef parent2_h #include "parent2.h" #endif #endif  class file1 { };  #endif     

i have list of such matches. e.g here searching parent1_h, parent2_h etc have more grandparent1_h, greatgrandparent_h etc

so essentially, approach thinking is, search input symbols(parent1_h etc) in files , if match found, add text(#ifndef noparent) above , #endif below.

input symbols many , files in replace.

can please me script using sed/awk/perl. or other language/script(bash etc) great!

i novice user of sed/awk/perl use help

thanks lot :-)

best regards, marc

edit: did not read correctly request. seems give correct o/p

awk '/parent1_h/ {print "#ifndef noparent" rs $0;f=1} /#endif/ && f {print $0;f=0} !/parent1_h/' file