Clear

Clear is a built-in shell script for use within ComputerCraft. Running it wipes the current display and moves the cursor to the top left position.

The equivalent code (for use within your own scripts) would be:

term.setBackgroundColor(colours.black)  -- Set the background colour to black.
term.clear()                            -- Paint the entire display with the current background colour.
term.setCursorPos(1,1)                  -- Move the cursor to the top left position.