[CentOS] awk global replacement only after keyword

>>or do you mean
>>blah, blah
>>blah, blah
>>yadda, yadda, keyword,
>>to-be-replaced
>>also-to-be-replaced?
>
> Yup, the keyword marks the position where I then start looking
> for matches. Once I get to work, I will give these a try.
>
> Thanks guys!

Sure. And what you want is just
{ if ($0 ~ /keyword/ ) {
     start = 1;
  }
  if ( start == 1 ) {
     sub( str, repl );
     print $0;
  }
}

          mark