bash 中 $RANDOM 环境变量的种子
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Seed for $RANDOM environment variable in bash
提问by Juan
I am working on a bash script that uses the $RANDOMenvironmental variable as an input in a simulation. The variable does what it say, give random integers, and I as far I understand it is taken from /dev/random.
我正在编写一个使用$RANDOM环境变量作为模拟输入的 bash 脚本。该变量按照它所说的做，给出随机整数，据我所知，它取自/dev/random.
However I would like to have a reproducible simulation, then the pseudo-random generator should be initialized with a seed; is it possible to have a seed for the $RANDOMvariable in bash?
但是我想要一个可重复的模拟，那么伪随机生成器应该用种子初始化；是否有可能$RANDOM在 bash 中为变量提供种子？
回答by chepner
From the man page:
从手册页：
RANDOM Each time this parameter is referenced, a random integer between
0 and 32767 is generated. The sequence of random numbers may be
initialized by assigning a value to RANDOM. If RANDOM is unset,
it loses its special properties, even if it is subsequently
reset.
Note that assigning a value to RANDOMactually seeds it; the assigned value won't be the next value returned.
请注意，为RANDOM实际种子分配一个值；分配的值不会是下一个返回的值。
$ RANDOM=1341
$ echo $RANDOM $RANDOM $RANDOM
26571 16669 28842
$ echo $RANDOM $RANDOM $RANDOM
14953 18116 2765
$ RANDOM=1341
$ echo $RANDOM $RANDOM $RANDOM
26571 16669 28842
$ echo $RANDOM $RANDOM $RANDOM
14953 18116 2765
