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45 lines
1.2 KiB
ReStructuredText
45 lines
1.2 KiB
ReStructuredText
\section random random - generate random number
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\subsection random-synopsis Synopsis
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\fish{synopsis}
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random
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random SEED
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random START END
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random START STEP END
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random choice [ITEMS...]
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\endfish
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\subsection random-description Description
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`RANDOM` generates a pseudo-random integer from a uniform distribution. The
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range (inclusive) is dependent on the arguments passed.
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No arguments indicate a range of [0; 32767].
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If one argument is specified, the internal engine will be seeded with the
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argument for future invocations of `RANDOM` and no output will be produced.
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Two arguments indicate a range of [START; END].
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Three arguments indicate a range of [START; END] with a spacing of STEP
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between possible outputs.
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`RANDOM choice` will select one random item from the succeeding arguments.
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Note that seeding the engine will NOT give the same result across different
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systems.
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You should not consider `RANDOM` cryptographically secure, or even
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statistically accurate.
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\subsection random-example Example
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The following code will count down from a random even number between 10 and 20 to 1:
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\fish
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for i in (seq (random 10 2 20) -1 1)
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echo $i
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end
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\endfish
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And this will open a random picture from any of the subdirectories:
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\fish
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open (random choice **jpg)
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\endfish
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