If you're going to port something, _port_ it.  Make it work EVERYwhere.
   Otherwise it's as useless to the general populace as the scripts I keep
   around for doing my job.

By that logic, we would be compelled to remove large chunks of our
source tree.  Such an attitude is why it often takes years for a
better tool to be adopted (c.f. compress vs. gzip wars), and if
anything only stunts progress.

On the other hand, I have mixed feeling about a `recursive grep'.
This is not an endorsement.