Generate random number in Shell

The original article was written at 18:29:20,. NetEase blog has been deleted.
To generate a random number in shell, you can call $ random in Bash to reference an introduction to random.
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.
To generate a random number in the range, you can use:
Declare-I randomnum = $ random * $ scale/32767
Similarly, to use declare, it must be in the bash environment.

Supplement:
The first line of shell must be #! /Usr/bin/bash