random number generator

i just happen to know that we can easily generate random number using $RANDOM

$ echo $RANDOM
12517
$ echo $RANDOM
18362
$ echo $RANDOM
26219
$ echo $RANDOM
26056
$ echo $RANDOM
30305
$ echo $RANDOM
9606

but if you want to get smaller random number eg. less than 100, you can do this:

$ number=$((RANDOM%100))
$ echo $number
75

20 random numbers less than 100:

$ count=1
$ while [ $count -le 20 ] ; do number=$((RANDOM%100)); echo $number; let "count += 1"; done
93
14
19
96
61
86
63
48
45
26
11
0
89
54
11
84
17
10
99
12

random number less than 10:

$ number=$((RANDOM%10))
$ echo $number
4

5 random numbers less than 10:

$ count=1
$ while [ $count -le 5 ] ; do number=$((RANDOM%10)); echo $number; let "count += 1"; done
3
4
9
6
7

and so on...