已索引

产生指定位数的随机数字

# echo $RANDOM | md5sum | cut -c 1-32

产生指定范围的随机数字

#!/bin/bash

function rand(){
    min=$1
    max=$(($2-$min+1))
    num=$(date +%s%N)
    echo $(($num%$max+$min))
}

rnd=$(rand 1 48)
echo $rnd
exit 0

从元素池中生成随机字符串

#!/bin/bash 
length=8 
i=1 
   
seq=(0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j k l m n o p q r s t u v w x y z A B C D E F G H I J K L M N O P Q R S T U V W X Y Z) 
   
num_seq=${#seq[@]} 
   
while [ "$i" -le "$length" ] 
do 
 seqrand[$i]=${seq[$((RANDOM%num_seq))]} 
 let "i=i+1" 
done 
   
echo "The random string is:" 
for j in ${seqrand[@]} 
do 
 echo -n $j 
done 
echo