roll (program to roll dice specified in a simple and intuitive way)

Rolls a user-defined dice sequence. The dice to roll are defined
using dN where N is the number of sides. Dice can be rolled multiple
times by prepending the number of repetitions (e.g., 3d6) and used in
simple mathematical expressions (e.g., 2d8+4).

D&D players rolling up character stats can say "6{3d6}", or if you
want to cheat a bit, "6{3d6>2}" (rejects rolls of 1 or 2). See the
EXAMPLES section in the man page.

See also: games/rolldice