esto es un poco extenso, como para pegar el manual, pero estoy completamente seguro que no estan (al menos -a)
y en el caso de -b, esta es la info :
Cita: -b Each line is preceded by the block number on
which it was found. This is useful in
locating disk block numbers by context.
Block numbers are calculated by dividing by
512 the number of bytes that have been read
from the file and rounding down the result.