Random Number Between 1 And X

echo $[RANDOM%X+1]
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.

2010-08-07 02:43:46

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What Others Think

The $[] form is deprecated. Use $(()) instead.
dennisw · 558 weeks and 1 day ago
This is simple, but not sh compatible. Just bash compatible. Il prefer the awk version.
dooblem · 557 weeks and 6 days ago
num-utils has a 'random' function where you just have to do: random 1..5
matthewbauer · 557 weeks and 6 days ago
The solution is wrong, or at least not well explained, because X have to be lower than 32767 (see man bash) The awk version is ok, but you've to know that the seed generation is based in clock, so if you ask for numbers in a certain interval, you'll get the same numbers!! num-utils package contains numrandom command, but it is not very efficient, because it generates a list of numbers and then picks one :P
sucotronic · 396 weeks and 5 days ago
how can i give x like an argument betweeen 100-100000
gerih26 · 378 weeks and 6 days ago

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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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