[X-Unix] Changing a file's open-with program at the command line.

[Stroller]

Hi there,

When I set up a new Mac, one of the first things I do is helicopter-I  
on an MP3 file, choose "Quicktime" from the open-with drop-down and  
then apply that to all files of this type. There is nothing more  
annoying than an MP3 voicemail from your Mum being added to your  
iTunes library right beside "I touch myself" by the Devinyls.

The downside of this is that if I want to get up from my computer to  
make a cup of tea, and decide that it would be nice to have the  
Devinyls blaring out whilst I do so, I have to click on iTunes and  
wait for it to open before searching for the track. What would be much  
better is for songs in my iTunes library to open with iTunes so that I  
can just Spotlight for them & click ok. Actually, I can do this at the  
moment, but they open in Quicktime, so the played count &  
favouriteness indicators aren't incremented.

Clearly cron jobs are the answer to all the world's problems.

What's the command-line tool to change the open-with program for a  
single file, please?

In conjunction with `find` this will bring world peace.

Google is unhelpful, or perhaps that's my search terms.

Stroller.