Shell Programming and Scripting

for file in $(grep -l "$find" $path)   #finds files with searched value 
      do
           echo " "
           echo "Modifying : " $file
           sed  's/'"$find"'/'"$replace"'/g' $file > temp.txt
           mv temp.txt $file
           echo " "
           echo "Modified : " $file
      done

awk '
BEGIN {
  printf "Word to replace? "
  getline s < "-"
  printf "Replace with? "
  getline r < "-"
}
{ while(index($0,s)) {
    print "Replace the first " s " with "r"?"; print
    getline yn < "-"
    if(toupper(yn)=="Y"){
      sub(s,r)
    }
    else {
      sub(s,"_")
    }
  }
}
{
  gsub("_",s)
  print > "newfile"
}' filename

for file in $(grep -h -l "$find" $path)
do
nawk -v find=$f '  #not working
BEGIN {
  #printf "Word to replace? "
  #getline find < "-"
  #find=$f
  printf "Replace with? "
  getline replace < "-"
  print find
  print replace
}
{ 
   while(index($0,find)) {
    print "Replace "find" with "replace"?"; print
    getline yn < "-"
    if(toupper(yn)=="Y"){
      sub(find,replace)
    }
    else {
      sub(find,"_")
    }
  }
  
}
{
  gsub("_",find)
  print > "temp.ftxt"
}' $file

mv temp.ftxt $file

nawk -v find=$f -v replace=$r '
BEGIN 
{
  ...
  ... 
}
{ 
 while(index($0,find)) 
      {
          print "Replace "find" with "replace" (y/n) ?"; print
          getline yn < "-"
          if(toupper(yn)=="Y")
             {
              sub(find,replace)###### ONLY REPLACING ONE WORD
                                           ###### NOT EVEN WORDS SEPARATED BY SPACE
             }
          else 
             {
                sub(find,"_")
             }
       }
  }
  {
  gsub("_",find)
  print > "temp.ftxt"
  }' $file
  mv temp.ftxt $file

nawk -v find="$f" -v replace="$r"