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The most useful of these commands is "map" - it lists what file systems EFI could find. Then one changes to a file system using a command such as "fs2:", where fs2 is the alias map listed for the filesystem you want to browse further. Rather like DOS "D:", but with multiple letter drive names. Then you can "dir" and "cd" your way around. Each drive alias maintains its own current directory, also like DOS.

There is a build environment for making your own C programs, with a reasonable suite of system calls you can make, of similar use to the command line stuff I listed in the table above. You can run your own commands that you built, off your hard drive.

Red Hat should have no problem getting Linux to boot off one of these Macs. It should be a simple matter of recompiling and dealing with a few minor porting issues the same EFI and elilo (Intel's extended lilo) code that anyone working with Itanium IA64 has been dealing with for years.