how to double space text?

[kemp at noscvax.UUCP]

What is the best (simplest, most efficient) way to double space a (simple) text?
I DO NOT want page numbers or other such nroff goodies, just the SIMPLEST
way to double space a text, via a system command such as cat....
  Preferably, the technique should lend itself to scripts and/or pipes.

      Steve Kemp
      Computer Sciences Corp.
      Naval Ocean Systems Center
      San Diego, CA

      kemp at nosc
        -or-
      ...sdcsvax!noscvax!kemp