Proposal: Add showCommandForUser to process:System.Process

[Edward Z. Yang]

Excerpts from Simon Marlow's message of Wed Sep 15 10:53:11 -0400 2010:
> The System.Cmd API is already OS-dependent in this sense: 
> System.Cmd.system passes the string to /bin/sh on POSIX and cmd.exe on 
> Windows, so Ian's proposal is consistent with that behaviour.

Ah, that's right. Basing this function on the behavior of system() seems
like the right thing to do.

Edward