在shell中產生隨機數

原文寫於2010-11-03 18:29:20,網易部落格,已刪.
     要在shell中產生隨機數,在bash中可以調用$RANDOM,引用一段對RANDOM的介紹.
     Each time this is referenced, a random integer between 0 and 32767 is generated. The sequence of random numbers may be initialized by assigning a value to RANDOM. If RANDOM is unset, it loses its special properties, even if it is subsequently reset.
     要產生一個範圍中的隨機數,可以用:
        declare -i randomnum=$RANDOM*$scale/32767
     同樣,要使用declare,必須是在bash環境中.

     2011-07-02 補充:
     shell第一行必須是#!/usr/bin/bash