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find [folder] -type f | xargs -I {} grep -li "text" {} | xargs perl -pi -e 's/abc/def[text_to_search_for]/[text_to_search_for]/g'

find [folder] -type f {search the specified folder for all files, returns full path of each file}
    | xargs -I {} grep -li "[text]" {} {piped into xargs to grep for all files containing specified text ignoring case}
    | xargs perl -pi -e 's/[text_to_search_for]/[text_to_replace_with]/g' {pipe list of files and search/replace with specified text}