EDIT: Realized I needed 2 open statements so this is where I'm sitting currently:
OPEN (UNIT = 10, FILE = 'fname', STATUS = "OLD", ACTION = "READ", IOSTAT = ierror)
IF (ierror /= 0) STOP "Error opening file. Aborting."
i = 1
DO
READ(10,*,IOSTAT=ierror) nums(i)
IF (ierror /= 0) EXIT
i=i+1...