Random Number Between 1 And X

(od -An -t u8 -N8 </dev/urandom; echo X '* 2 64^/1+p') | dc

This provides better, but not perfect, distribution, and it works for 2^32 ≤ X ≤ 2^64. (A robust distribution requires iteration/recursion and an indeterminate amount of randomness.)

By: imuli

2015-02-15 19:14:24

echo od random number integer

4 Alternatives + Submit Alt

Random Number Between 1 And X

If X is 5, it will about a number between 1 and 5 inclusive. This works in bash and zsh. If you want between 0 and 4, remove the +1.
This is sample output - yours may be different.
29

echo $[RANDOM%X+1]

goodevilgenius · 2010-08-07 02:43:46 15
Random Number Between 1 And 256

It takes a byte from /dev/random whose source is the kernel entropy pool (better source than other solutions). Show Sample Output
This is sample output - yours may be different.
```
 189
```
6

od -An -N1 -tu1 /dev/random

sucotronic · 2013-09-10 08:57:16 124
Random Decimal in the interval 0 ≤ n < 1 and 2d6 dice roll

2d6 dice: awk 'BEGIN { srand(); a=int(rand()*6)+1; b=int(rand()*6)+1; print a " + " b " = " a+b }' 3 + 6 = 9 Show Sample Output
This is sample output - yours may be different.
```
0.902879
```
-2

awk 'BEGIN { srand(); print rand() }'

dennisw · 2010-08-07 14:33:12 6
Random Number Between 1 And X

This is /bin/sh compatible.
This is sample output - yours may be different.
-4

echo "$(od -An -N4 -tu4 /dev/urandom) % 5 + 1" | bc

dooblem · 2010-08-10 12:10:21 6

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What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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