-- Used to set a seed value for random.
math.randomseed(os.time())
--random value between 0 tand 1
print(math.random())
--random integer value from 1 to 100 (both inclusive)
print(math.random(100))
--random integer value from 20 to 100 (both inclusive)
print(math.random(20, 100))
0.0012512588885159
20
54
os.time() has resolution down to seconds which means that if you invoke
the command multiple times within a given second you’ll get the same values back.
You can try using more entropic sources for seeding like /dev/random.