[LUA] Reusing a set of instructions

Hi there. I'm fairly new to computercraft/lua/programming, but learning fast. One thing I'm wondering about is, is there a way to write out a set of instructions (eg for a mining turtle) and somehow save them and reuse them throughout a lua program without needing to retype everything? This is in a case where looping is not applicable. Thank for the help.

Are you looking for functions?

function doStuff()
  turtle.up()
  turtle.forward()
  turtle.down()
  turtle.back()
end

doStuff()
--later
doStuff()

By 'set of instructions' I assume you mean programs?

You can save your programs to disks, so you can reuse them when you break your turtle, or on another turtle. You'll need a disk drive and a floppy disk. There's a forum thread here on saving programs to a floppy disk.