CosmOS
> dir          list what is on the disk
load <file>  read a program off the disk
run [words]  start what was loaded, and tell it those words
delete <file>        take it off the disk
rename <file> <to>   call it something else
dump         sixty four bytes of memory, and again for more
             dump <program|data|bank> <address>
help         this
exit         stop
> greeting.txt            17
filler1.txt             8
filler2.txt             8
filler3.txt             8
filler4.txt             8
filler5.txt             8
filler6.txt             8
filler7.txt             8
filler8.txt             8
across.txt              700
empty.txt               0
aName22CharactersLong!  22
12 files
> > I do not know: frobnicate
> halted
Execution halted.
[exit 0]