mirror of
https://github.com/fish-shell/fish-shell.git
synced 2024-12-03 00:16:20 +08:00
02d82dcf85
Adds synopses for those commands missing them. Moves all synopsis sections to code blocks. This improves the appearance, although highlighting as fish code may not be the ideal appearance.
58 lines
1.2 KiB
ReStructuredText
58 lines
1.2 KiB
ReStructuredText
.. _cmd-random:
|
|
|
|
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) is dependent on the arguments passed.
|
|
No arguments indicate a range of [0; 32767].
|
|
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 of [START; END].
|
|
Three arguments indicate a range of [START; 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)
|
|
|