/textdisplay - Shows commands
/textdisplay help - Shows commands
/textdisplay create ID CONTENTS (nln for new line) - create a text display with the specified id and contents
/textdisplay delete ID - delete the specified text display
/textdisplay list - Lists all displays
/textdisplay tphere ID - teleport the specified text display to you
/textdisplay rotate ID rotation - rotate the specified text display
/textdisplay setbillboarding ID (center/fixed/vertical/horizontal)- set the billboarding type of the specified text display
/textdisplay scale ID scale - set the scale of the specified text display