Printing arbitrary line range from files

[lisa-asket]

I want to print lines from files starting from line number "na" to line number 
"nb".



Have written the following function, which uses head, but now want to extend it 
to use

"sed" with "na" and "nb".



headrc ()
  {
    find "$2" \( -name \*.org -o -name \*.texi \)  \
      | xargs head -n "$1";
  }