random - generate random number¶
Synopsis¶
random
random SEED
random START END
random START STEP END
random choice [ITEMS...]
Description¶
random generates a pseudo-random integer from a uniform distribution. The
range (inclusive) depends on the arguments.
No arguments indicate a range of 0 to 32767 (inclusive).
If one argument is specified, the internal engine will be seeded with the
argument for future invocations of random and no output will be produced.
Two arguments indicate a range from START to END (both START and END included).
Three arguments indicate a range from START to END with a spacing of STEP
between possible outputs.
random choice will select one random item from the succeeding arguments.
Note that seeding the engine will NOT give the same result across different systems.
You should not consider random cryptographically secure, or even
statistically accurate.
Example¶
The following code will count down from a random even number between 10 and 20 to 1:
for i in (seq (random 10 2 20) -1 1)
echo $i
end
And this will open a random picture from any of the subdirectories:
open (random choice **.jpg)
Or, to only get even numbers from 2 to 20:
random 2 2 20
Or odd numbers from 1 to 3:
random 1 2 3 # or 1 2 4