rolldice - rolls virtual dice
rolldice [ options ] [dice_string
rolls virtual dice. The dice strings passed on the command line
contain information on the dice to roll in a format comparable to the format
used in most role playing games.
If no dice strings are provided as command line arguments, rolldice
stdin as input.
- returns the usage of diceroll
- returns the version of diceroll
- uses /dev/random for random number generating
- uses /dev/urandom for random number generating
- prints out the result of each individual die separately, as
well as the operations and totals
- prompts the user to input dice strings. Differs from normal
stdin input in that errors do not cause the program to immediately exit,
but rather return to the prompt.
The dice string uses the following format:
The dice string doesn't have to be in the exact format outlined above, but this
is the order I use. It will try to parse any different string containing the
same sections in the best way it can, and will throw out anything that isn't
one of the sections below.
- The first number is the number of dice to roll, and the
second number is the number of sides the dice have. The numbers rolled on
each die are then added up and given as the result. Hence 3d6 means
"roll three six-sided dice, add them together and return the
result". If the first number is left out, then the number of dice
defaults to 1. If the second number is not a number, but a percentage sign
(%), then the number of sides becomes 100 (for a percentage roll). If this
is not included in the dice string, then the default is 1d6.
- This number describes how many times to roll. For example,
if you want to roll 3 6-sided dice 6 times, you use the dice string 6x3d6.
This returns six numbers, corresponding to the six different rolls.
- This number describes how many times to multiply the result
of each roll. 3d6*100 returns a number in the range of 300-1800, because
3-18 is the range for 3d6 and the result is then multipled by 100.
- This number is the modifier to be added or subtracted,
depending on the sign, from each roll. 1d4+1 results in a range from 2-5
(1-4 for the die, plus 1). This step is handled *after* the multiplication
- This number describes how many lowest dice rolls to drop.
This step is handled *before* the multiplication modifier.
in the order show above. For an extreme example, "3x4d6*5+1s2" would
roll four six-sided dice, drop the lowest two, multiply the result by 5, add 1
to that, and repeat the process two more times, for a total of three results.
The following error messages may appear on STDERR:
Requested * is too large
Memory could not be allocated while parsing
the string passed to the rolldice program
Problems with the malformed dice string
The dice string contains a syntax error (see
upper section DICE STRING FORMAT)
An unknown command-line option was
The exit values returned by rolldice
follow the BSD convention.
Stevie Strickland <firstname.lastname@example.org>
1.16 - 18 Dec 2012